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Category Archives: Gardens of Alcatraz
In part 3 of our “Gardening through the Decades” series, we look at the Roaring Twenties. A time period known for its glittering excess and the start of the gangster era, this was a period of transition for Alcatraz. Alcatraz the Military Prison was ending, but there were still families on Alcatraz, and they were determined to make their gardens beautiful.
From the blues and purples of the Victorian Era, to the pinks of the 1900s and 1910s, these gardens were all about colorful flowers. This changed in the 1920s as the reigning trend became all about the green. There were still flowers, but the lawns became a fixture for many homeowners.
Likewise, they also had a desire to celebrate and welcome nature. Unlike the Victorians, however, their gardens weren’t allowed to grow wild. Instead, they started attracting wildlife. Bird houses, bird baths, fish ponds, and rock gardens were all the rage for the 1920s gardener. They also planted trees and bushes with bird attracting berries, such as holly and crabapples, in hopes of being a paradise for bird watchers.
The 1920s also marked a shift in landscaping focus. Before, backyard gardens were all the rage. It was a private space for entertaining and for showing off your beautiful collections of flowers. However, with more and more people owning homes in the suburbs, the front yard as a public space became the focal point. You couldn’t have your neighbors walk by and see your front lawn in a deplorable state. So, this space received the most attention with gardening and landscaping. Walkways and driveways were lined with perennials, such as irises, foxgloves, hollyhocks, California poppies, and bachelor’s buttons. Shrubs such as boxwood and holly provided the natural, bird attracting green that was so popular. And the lack of fences reinforced the idea that the front yard was public, and not private.
Alcatraz follows many of these trends. While most families lived in the apartment building, meaning no front yards, houses on the parade ground did have front yards. We also have many of the hallmarks associated with the 1920a.boxwood in Officers’s Row and along the Sally port provide some subtle barriers between walkways and garden space. Likewise, one can see California poppies dotting every garden on Alcatraz.
What is perhaps the most striking feature that relates to the 1920s garden aesthetic is the birdbath in the birdbath garden on the west side. The birdbath was originally designed by inmate Elliot Michener. It was sadly destroyed when the gardens were no longer cared for. Thanks to our handy and multi-talented volunteers, we were able to reconstruct the birdbath that is a pleasant surprise in the Bird Bath Garden. Thanks to our work in the gardens, we have many birds for the bird watchers among us. From the snowy egrets to the variety of songbirds, Alcatraz does attract wildlife.
The Roaring Twenties peaks through in many areas of the Alcatraz gardens. Look around the next time you’re out there and see if you can spot any of the historical elements.
Over the years, gardeners have developed ways to keep the plants alive and beautiful. From prisoners with garden hoses to Shelagh Fritz and the water catchment system, the gardeners have worked with San Francisco’s climate to create beautiful flowers.
However, things are starting to change. Climate change is having an impact on the plants around Alcatraz. San Francisco used to have predictable and stable weather. It would rain from about November to January. It would be dry and foggy in the summer. And generally, the temperatures would stay between 50- and 70-degrees Fahrenheit year round, with a few days in August raising above. This predictable weather pattern is great for gardeners as it allows for planning. You can collect rainwater in the winter and then use what you collected throughout the summer to keep the gardens thriving. The lack of frost meant that plants could bloom longer and grow larger, something all gardeners want. While it’s true non-native plants can have a harder time with the climate, with proper care, they can thrive.
One of the first major signs of climate change affecting the plants on Alcatraz was the California drought. The drought from 2011 to 2017 was one of the worst in California’s history. 2011 to 2014 was the driest period in California history since record keeping began. In 2001, the annual precipitation was 25.03 inches. In 2011, the annual precipitation was 15.64 inches, nearly ten inches less than ten years previously (Data from Golden Gate Weather Services: https://www.ggweather.com/sf/monthly.html). Because of the drought, there wasn’t water available during the summer from the water catchment system. Even on areas where the island was not watered regularly suffered. The Persian carpet used to look very vibrant and pink on the cellhouse slope. Even after nearly three years of steady rainfall, it has yet to recover.
The average yearly temperature has also increased (see graph). The average temperature for the year has not been 55 degrees Fahrenheit since 1975. Two years in a row (1996 and 1997) the average temperature has been above 60 degrees Fahrenheit. And while an increase of about one or two degrees doesn’t seem like a lot, it can wreak havoc on the plants.
Frost is starting to appear on Alcatraz, which as any gardener knows, can cause plants to hibernate and in some cases die. Summers are experiencing less fog and winters less rain with the rain coming in short downpours that just runoff. Gardens and gardeners can adapt over time. However, what can be said for wild landscapes?
The second in this “Historic Gardening Trends” series, we are now moving out of the 1800s and into the 1900s. The 1900s through the 1910s had their own gardening trends; building from what was popular during the Victorian era but rejecting and changing what new gardeners did not like about the style. Alcatraz itself was going through a change. The Civil War had brought a rapid amount of development and change in the structures, trickling down to the gardens. The construction of the main concrete cell block began in 1909 and, once again, the wives of the soldiers sought a way to bring life and civilization to the Rock via gardens.
By the end of the 19th century and the beginning of the 20th century, there was a trend to return to formal gardening. There was no longer a desire to have a “garden growing wild” aesthetic. The plants were often carefully pruned and nurtured to be contained. Furthermore, there was more of an effort to use architecture in gardening. With building projects being wider-spread, people sought to show off their house and its features, using the garden to direct the eye. Similarly, using concrete terraces, paths, and steps provided a bit more structure and more of an architectural feel. The Victorian tradition of using gardens as an outside room continued and would continue to be a hallmark of modern gardening practices. Gardens were places to gather with family and friends, not just a place to grow food. Water was another major feature in the early 1900s gardens. Fountains, pods, and waterfalls were popular.
The plants themselves were almost an afterthought to the garden. Gardeners used geometric lines and an enclosed feeling to make the outside feel more like the inside. Furthermore, the Victorian fascination with wild, sprawling exotics was replaced with neat, boxed hedged beds. The actual flowers and shrubs were kept off verdant laws and bowling greens. It was no use having people over to your garden if they could not walk around without stepping on flowers.
Inside these neat and tidy beds were a variety of peonies, irises, lavender, erigeron, and foxgloves. The colors were muted but more diverse than the Victorian era’s use of mainly greens, pinks, and purples. Roses were common as well. However, instead of ramblers and creepers allowed to sprawl and climb, they were contained into neat, round bushes.
The modern gardens of Alcatraz have these early 1900s touches hidden throughout. The water features are easy to spot since this is an island and the ocean serves that purpose nicely. The foxgloves can be found most commonly in the Rose Garden. While there are creepers and ramblers all over, other rose bushes, such as those in Foundation 8 of Officers’ Row, are kept rounded and contained. Lavender can be spotted peaking through in Foundation 9. The Toolshed Terraces gardens bring forth a more architectural element to these gardens, a subtle call back to the terraces commonly used during this time period.
What is perhaps most in line with the gardening style of the early 1900s is the fact that the gardens serve as a backdrop to the architecture, the prison. Instead of the garden being a separate entity, it is tied to, and often overshadowed by, the main cellhouse. The beds along the pathway are contained and wind around following the road; they are not allowed to grow wild and eclipse the cell house. As gardeners, we sometimes forget people come to Alcatraz not for the gardens, but for the prison. In the 1900s, the gardens were also there as a second thought; meant to enhance life and beauty on the island. It moves away from the “natural” and into the backdrop. These gardens have their own beauty and serve another purpose. But the combination of styles from such a long period of time is what allows the Gardens of Alcatraz to be diverse and beautiful, to represent a time and provide a look back as to what life would have been like for the families living on the island, and not just the prisoners and guards.
One of the most beautiful groups of flowers we have on Alcatraz is the iris. They have been a common staple in gardens for centuries. It is worth taking a moment to look at the long history of these flowers and when they became common garden staples in America.
Irises first grew to prominence as a garden flower in 1469 BCE. The Egyptian pharaoh King Thutmose III conquered Syria, where irises grew. An avid gardener, he brought them back to Egypt to be cultivated. This was the first-time irises had been documented as a gardening flower. From there, irises rose to prominence for their religious significance. They were carved into sculptures at temples and doctors used the rhizomes for medicine and perfume offerings.
As irises began to spread in the popularity, due to their showy flowers and lovely scents, the Greeks were the first to name them “iris”. Iris means rainbow and is the Greek messenger of the gods. Indeed, irises come in an array of colors, from deep purples to brilliant oranges. They continued to spread around Europe, becoming a staple in gardens from Spain to parts of Asia. Indians began to use their rhizomes for religious offerings. In Florence, Italy, the scent became a popular perfume. The iris inspired the design for the Fleur-de-lis. It is a common motif in France, past French Colonies, and with the Catholic Church, usually relating the Virgin Mary.
The first documented iris in America was in 1600s Virginia. From there, irises would continue to hybridize, speciate, and transform into unique American varieties. It wasn’t until Michael Foster (1836-1907) studied and planted these beautiful flowers, that irises were made popular. One of his students, William R. Dykes (1877-1925) took an interest in irises and published a book called “The Genus Iris”. It was this study of irises that brought the flower to the popular conscious. In the early 1900s, there was a rise of irises in American gardens. It became so popular, Tennessee adopted it as the state flower. The most popular iris today is the German or Bearded Iris, an iris we have on Alcatraz. However, most irises have hybridized so much that there are 300 species, and these species are difficult to separate into a clean taxonomy.
The hybridization provides another unique focal point for Alcatraz’s irises. If you smell a modern iris, it doesn’t smell like much. On Alcatraz, the irises have a stronger scent. Different Alcatraz irises smell like root beer, vanilla, and grandma’s perfume (according to
some visitors). We have pastel purple, deep purple, white, orange and yellow Irises scattered about the Rose Garden and Officers’ Row. We use heirloom plants, which means our irises still have the genetic markers to make scent. Our use of heirloom plants provides an extra touch of historical intrigue to visitors who know their flowers.
As a flower, irises inspire the creative and bring delight to the floral enthusiast. They provide intriguing patterns and interesting shapes. They are unique and vibrant against the backdrop of stone and concrete. They are a flower with a long history, and it’s not hard to see why they’ve been a garden staple for thousands of years.
Alcatraz’s gardens were restored with the intention of being a reflection on gardening trends found from the 1830s to the 1960s. But what trends came in and out of fashion during this period? After all, much like clothing, gardening has styles, trend-setters, and certain characteristics that allows gardening historians to identify what was popular at the time.
The Victorian Era, named after Queen Victoria, was a period that ran from 1837 to 1901. This was one of the first times authorities made an effort to provide public gardens in England. The reasoning being the gardens would improve the manners of the lower class. The wives of soldiers on Alcatraz had a similar desire. They wanted to bring a sense of civilization and order to “The Rock”. There was also a need to ease boredom. With little to do while on Alcatraz and with the new soil and sand, they could begin to garden.
The Victorian Garden has three major characteristics: furniture, statues, and plants. The furniture used in Victorian gardens included benches, canopies, and pavilions. The purpose was to make the gardens feel more like a salon. It was a place to entertain and enjoy nature as well as show off to your neighbors how well you were doing. Statues were also used in Victorian gardens. They were mostly Greek Gods and semi-nude females. It was an attempt to invoke the classicism and culture of Ancient Greece.
The plants were where Victorian gardens started to become unique. Shades of pink, purple, and green were the most common colors. There were also many different types of plants in each garden. Thanks to globalization and imperialism, gardeners had access to more rare and exotic plants than ever. Orchids, tulips, roses, and daisies were all regulars in Victorian gardens. The rarer the plant, the more wealth you had. Another interesting style choice was the various ways these gardens were planted. There were showy, geometrically placed flowers (squares being the most popular shape, followed by triangles). Yet, there was also a call to have “wild” gardens. Creepers, ramblers, hardy shrubs and herbaceous plants emphasized the natural look. Pebbles marked the pathways and they used rocks invoked the image of wild and far off mountains.
On Alcatraz, the Rose Garden is where these Victorian trends are the strongest. The various roses are allowed to creep and ramble over concrete railings and walls. Come at the right time and you’ll see rows of various types of blue bells in both Officers’ Row and the Rose Garden. In Officers’ Row, there is a hidden cache of lavender, showing off muted greens and purples. Luckily, we don’t have to import rocks to get a “rocky” feel throughout the gardens. Alcatraz’s natural terrain already provides us with outcrops of rocks. We even kept the tradition of having rare and exotic plants in our gardens. One of the more famous examples is the Bardou Job Rose, a rose that is so rare it was thought to be extinct until it was found growing on Alcatraz in 1989.
The Victorian Garden is one of contradictions. It is a call back to the wild, but it is characterized by geometric designs and exotic plants. It is an attempt to bring civilization and good manners to the lower classes, but it is also a sign of wealth. On Alcatraz, we try to capture the complexity and beauty in our gardens. And as the climbing roses make their way up the rocky outcrops and bloom, we capture a moment in gardening history.
It seems every day there are stories about pollinators. There are news stories detailing their decline. There are new “Bee Hotels” designed to attract solitary bees. There are websites dedicated to creating a list of plants to attract pollinators. As gardeners, we know pollinators well. Almost any plant that has a showy flower is likely to attract pollinators. Yet, pollinators are not limited to bees and butterflies. They also include ants, male mosquitos, beetles, flies, wasps, birds, and even some mammals and reptiles. Each pollinator has a job within an ecosystem and each plant has a pollinator it is designed to attract.
Preparations for planting at Black Point Historic Gardens are underway. There is a unique opportunity for us to use Alcatraz Gardens and what we learned to make Black Point more successful. Volunteers cleared away the overgrowth and replanted flowering plants. This gave rise to a noticeable increase in bees, flies, butterflies, and birds.
We know now there are at least ten species of bees in the gardens of Alcatraz, some of them native. However, no study was completed to create a baseline estimate for species diversity before restoration work began. We know the number of pollinator species before the military’s use of the island in the 1800s was likely zero since Alcatraz was a rock with no native vegetation. The wives of soldiers established gardens. These beautiful blooms provide food and habitat for the pollinators. A baseline would have helped us know if our efforts were beneficial and guide us to future planting plans.
As historical gardeners, we have a duty to present Alcatraz and Black Point as they would have been. Heirloom plants are used to represent a specific time frame. Even where we plant certain plants is dictated by historic photographs. As a result, the ideal gardens of the late 1800s through the 1960s guide us; and in those time periods, native pollinator gardens were not in fashion. As we design the plantings at Black Point, we wish to include plants that will help native pollinators but still have the look and feel of a Victorian strolling garden.
Studies have shown planting native plants and increasing the diversity of blooms will help native pollinators. So, we have begun to start observing pollinator species diversity and population numbers. Does the garden, previously overrun with ivy, blackberries, and oxalis, function as a pollinator garden? Does the presence of native California flowering plants help increase the amount of diversity? Do the pollinator population levels increase as more flowering plants and space are made available?
These are questions we want to answer. We can only learn from the past and use Alcatraz as a guiding force for Black Point.
I was fortunate today to be invited to the monthly meeting of the Alameda Master Gardeners to teach them the ‘paperwork’ side of gardening. It’s a side of gardening that most visitors are not aware of, even if they are gardeners themselves.
With Alcatraz being a National Historic Landmark, the National Historic Preservation Act applies to everything that is done on the island, not to mention the other roughly 2500 sites in the United States designated as National Historic Landmarks. Adopted as law in 1949 by Congress, National Historic Landmarks ‘are nationally significant historic places designated by the Secretary of the Interior because they possess exceptional value or quality in illustrating or interpreting the heritage of the United States.’ (https://www.nps.gov/nhl/)
Section 110 and 106 of the Preservation Act set out broad responsibilities of Federal agencies and requires the agencies to take into account the effects of their undertakings on historic properties. The Golden Gate National Recreation Area (GGNRA) does have its own team of a historic architect, historic landscape architect, archeologist and supporting staff to ensure that historic preservation is fully integrated into the ongoing programs within the Park.
Beginning the class off, I introduced the concept of a cultural landscape – special places that reveal aspects of our country’s origins and development through their form and features, and they ways they were used. The special places include a wide range of landscapes – residential gardens, parks, scenic highways, battlefield and institutional grounds.
There are 4 types of cultural landscapes – historic sites, historic designed landscapes, historic vernacular landscapes and ethnographic landscapes. Alcatraz Island is a cultural landscape and the gardens fit in the historic vernacular landscape category. This is a landscape that has evolved through use of people whose activities shaped the landscape. The landscape now reflects the physical, biological and cultural character of the everyday lives of the residents.
Alcatraz Island’s period of significance expands from 1847 to 1973. These years span the early exploration of the Bay, military fortification, including the construction of the first lighthouse on the west coast, the military prison, federal penitentiary and the early General Services Administration (GSA) caretaking, Native American Occupation and the beginning of the GSA while the island became part of the GGNRA.
Perhaps this is where people started to doze off…but we weren’t quite done with terms and definitions.
The Secretary of the Interior has Standards for Treatments, which is a series of concepts about maintaining, repairing, and replacing historic materials, as well as designing new additions or making alterations. The standards offer general design and technical recommendations to assist in applying the standards to a specific property.
In a nerdy way, these standards are why I love my job. Using the guidelines, you can transform an overgrown historic garden into a cared for landscape once again.
Of the 4 types of treatments – preservation, rehabilitation, restoration, and reconstruction – rehabilitation was chosen for the best method for the Alcatraz gardens. “Rehabilitation is making a compatible use for a property through repair, alterations, and additions while preserving those portions of features that convey its historical, cultural, or architectural values.”
Rehabilitation fit our goal – to preserve and maintain the gardens created by those who lived on the island during its military and prison eras, and to interpret their history, horticulture, and cultural significance for visitors. The island still had over 200 species of plants, the majority of these were ornamental survivors from past residents, and plenty of remaining garden paths that gave the framework of the gardens.
With the rehabilitation treatment chosen, we had many considerations to take into account – the use of the gardens – historic, current, and proposed use for the future, archeological resources, the natural systems (nesting seabirds and we had no fresh water), interpretation of the gardens to visitors, accessibility and safety, not to mention the management and maintenance of the gardens.
Beginning in 2005, a treatment plan was written up for each garden area that reflected the military and/or federal prison eras. Each plan contained historic photos, documented current existing conditions and described the future use. Working on one area per year, we finished the scope of our project in 2010.
The bulk of our work was done prior to Alcatraz Island having a Cultural Landscape Report (CLR). Most historic sites have a report that has documented all of the contributing features of a landscape. However, the longer we waited, features of the gardens and the plants themselves were failing. We received permission to have a Cultural Landscape Inventory done, a much faster process, and with our treatment plans we moved forward.
Now, with a CLR we are able to work on areas and while we still need our plans reviewed and approved, our plans fit into the overall plan for Alcatraz Island.
Finishing off the lesson with photos of historic, before, and after photographs of the gardens, the terminology learnt earlier made sense (or at least I hoped). Just like compost is the best foundation for thriving plants, well made plans make the best foundation for gardens.
Afterwards, people came up to chat and many remarked that they had no idea there was so much history on Alcatraz. I think this quote from Richard Moe, president of the National Trust for Historic Preservation says it best – “History is typically conveyed through books or in a classroom, but history can also be conveyed through place”.
Maybe next time just walking down the street, you’ll question why a row of trees was planted or why the fountain was placed where it was, or why a random granite block is in the sidewalk? The cultural landscape is everywhere around us, just waiting to be read.
Written by Josefina Pacheco
Before volunteering at Alcatraz, I worked at a summer camp in Maine that emphasized teaching ecology and sustainability to elementary and middle school aged students. After ten weeks of running around in the sun and eating lobster every Thursday I found myself asking the question that many college students find themselves asking after graduation, “So, now what?”. I began searching for jobs in the Bay Area and soon discovered that I needed more experience. A friend of mine suggested to look for an internship using volunteer.org; this is where I found the post about volunteering on Alcatraz. I thought to myself I could help with gardening (one of my favorite activities), volunteer (this means experience), and look for jobs at the same time. It seemed like a win-win situation.
I contacted Shelagh about volunteering in September 2016. In early October, I was given the unique opportunity to apply for the intern position at Alcatraz. After a cover letter, resume, and interview I became Alcatraz’s newest intern. As an intern I now get to go on the ferry five days of the week (yay!). Twice a week I work with the volunteers which usually starts off with answering the question “So, what are we doing today?”. I then quickly take attendance and work alongside the volunteers for the day’s project for the remainder of the morning. On the other days of the week, I work one-on-one with Shelagh. The day’s schedule varies day by day but some of the more notable ‘behind the scenes’ projects include: learning to prune roses, learning to transfer seedlings to planting pots, propagating succulents, assist with leading volunteer groups, and taking pictures of the watercolor paintings from the Alcatraz Florilegium next to the actual flowers from Alcatraz. Additionally as an intern, I’m learning in greater depth about gardening and plant maintenance in general, along with gardening specifically on Alcatraz and its history.
What many people don’t know is that as an intern one gets a stipend and housing at (one of the most breathtaking places) the Marin Headlands. At the Headlands, other interns from other parts of the Park live there as well. To help meet even more interns, specifically those in the Presidio, there are monthly intern swaps. At a swap, interns get to go to another park site and volunteer there for a day (so far I’ve only participated in the Milagra Ridge intern swap where I planted native grasses). To further enhance your knowledge there are Park Academy Classes held a couple times a month. The topics range from botany to fire management to leadership training. Being able to meet new people, volunteer at different parks, and learn more about whatever topic you want to learn more about makes this an incredible experience.
At first I was a little nervous about the transition from volunteer to intern but everyone (staff and volunteers) have been really helpful and supportive, so thank you and I’m looking forward to seeing the gardens through the seasons!
Alcatraz these days is a bustling place of projects. The big project of repairing the west side wall of the cellblock is very apparent but visitors can’t see the work being done as the scaffolding is wrapped in white plastic.
The other significant project that was just completed at the end of December was in full sight of visitors and left a dramatic difference to the island. The Eucalyptus grove at the south end of the island (just off the dock), was removed. The project had been two years in the planning and finally had enough urgency and funding to make it possible. The trees, originally planted by the military in the early 1920s, had reached maturity and were a safety risk of falling.
Marin County Arborists were trusted with the tree removal. The company had previously worked on tree removals on the island and was familiar with barging equipment over and working around visitors.
Sixteen blue gum eucalyptus trees and two non-historic Monterey cypress trees were removed and chipped over three weeks.
The chips were hauled to the Parade Ground to be stored until the National Park Service’s archeologist had a chance to examine the bare slope for evidence of military construction. We received the ‘all clear’ within a day of the trees being removed and we set to work!
First, chips from 18 trees is a heck of a lot more than I could envision! The recommendation from consulting arborist was to put the chips back on the slope to a depth of 4”, place jute netting over top and anchor wattles horizontally across the slope to stabilize the slope. The slope had been eroding badly for years, so this would be the perfect opportunity to stop the erosion.
Volunteer groups were enlisted to manually place the chips on the slope. With bucket brigades and teamwork, the slope was covered over a month. The Golden Gate National Parks Conservancy’s Stewardship Team (of which the Alcatraz Gardens is a division within the company’s organization) were set to take a day off from their normal sites and lend a hand. To sweeten the deal, an overnight was planned (and what better way to say thank you than a night in solitary?).
The effort was a huge success with people filling
buckets, people carrying the full buckets to the bottom of the slope, to the chain of people to send the full buckets up the slope, and empty bucket retrievers! Maria Durana captured the well-oiled machine of the bucket brigade:
Once the chips were in place, the jute netting could be placed on top. The rolls were heavy and we soon figured that cutting them first was best.
Aside from the Stewardship Team, four corporate groups and the regular drop-in garden volunteers pitched in to help spread the mulch. In total 900 yards of jute netting was placed and 750′ of wattles were installed.
The slope will be replanted with Eucalyptus cinerea ‘Pendula’ in September 2017 in keeping with the historic look of the island.
On another note of discovery, the perimeter wall of the Parade ground was further revealed along with the basement of one of the former cottages. And a new fern was found growing! With more years of planning to come, hopefully this neglected garden are will be the next focus of garden preservation.
The island’s first purpose as a military prison introduced the construction of the Sally port and this is where all visitors first walk by today on their way up to the cell house. Before entering the Sally port, they are greeted with the island’s first garden and home to some survivor plants thought to be planted in the 1920s. Among this bed are two historic Cordyline that are very old and are showing signs of decline. The Cordyline australis planted in the Sally port gardens is an old variety and have been very hard to find in the nursery trade. The Cultural Landscape report suggests that these be replaced, but not until we have the same plant with the same genetic makeup of the replacements.
In efforts to replace these declining historic Cordyline, we have tried several propagation methods to ensure they remain as part of the gardens for years to come. All of the methods were done in mid-March and we recently have had some promising results. Below are detailed descriptions of the propagation techniques trialed.
Methods of Propagation
We first tried just a cutting of one of the canes and potted it up in a pot of our compost. We removed some of the foliage and trimmed some of the fronds back to reduce that amount of energy going into the foliage and instead put it into the formation of roots. At first, it seemed as though this method might work, but after about a month, the fronds were almost all dead. The cane itself had become soft and the inside had become rotten. I think this method would work using a thinner cane or a smaller one with less foliage.
For this method, we took three pieces of cane, about 6 inches long each and laid them horizontally, half way deep, in a tray of sphagnum peat moss mixed with our compost. I had thought this method would work best, and we actually did have roots start to form alongside the canes, but I think they ended up getting over watered and the canes started to rot. Unfortunately, all three were unsuccessful. I think if we were to try this method again, we would use a different media composition and not allow the soil to get too wet.
The air layering method turned out to be the most successful of the three that we tried. This method is actually done on the mother plant itself. We started by soaking sphagnum peat moss for a few hours. This is crucial to keep the stem moisturized to allow roots to form. On one of the canes, we cut an inch wide ring through the cambium layer and removed the bark around the cane. Next, we took the soaked peat moss and wrapped it around the cut tightly and then wrapped it with plastic wrap and tied string around it to hold it in place. We did this twice more on separate canes. We recently cut the three successful air layered canes from the mother plant because roots had formed and they were ready to be potted up. We first soaked them before potting them to allow the peat moss to rehydrate. We put the new plants in five gallon containers and they are happily living in our greenhouse until they reach a more mature state with more developed roots to replace the ones at the Sally port.
The air layering method can be used for other woody shrubs and works well for some trees. This method does take a while to see some roots form, but once they do and it is cut from the mother plant, you already have a bigger plant than you would if you propagated it by seed or a cutting.
To replace the survivors, it is important that they are replanted with the same species of the current Cordyline. By propagating them by the methods we tried, it ensures that the replacements have the same genetic makeup of the current plants. We are very excited to have successful clones to replace the current failing Cordyline.