Sometimes it is not easy to uphold our garden goal of having every visitor amazed by the beauty of the gardens and to experience high horticultural standards. We wish that each of the 1.3 million visitors to Alcatraz a year (5000 per day) be able to appreciate the gardens regardless of the time of year -– whether they see them in the lushness of spring, or the dry and windy autumn.
The garden restoration is now in its tenth year, and we have really come to know the difficult areas of the gardens. The obvious is the windy west side, but even this side, through trial and error (much how the inmates learned), is for the most part flourishing at all times of the year.
One challenging garden area remains though – the series of terraces built by the inmates in the 1940s. Facing the Golden Gate Bridge, this area is a haven for hummingbirds and sparrows in the spring with the overflowing terraces of Echium and Chasmanthe, the complementary blue and orange colors standing out against the backdrop of the cell house.
The sandy soil has received annual topdressings of our rich compost for the past 3 years, but the soil still tends to dry out and become compacted mid-summer, despite hardly anyone walking on these beds.
These terraces do hold many of the survivor plants on the island – Echium, Chasmanthe, Aeonium, Artichoke, spuria Iris, Acanthus mollis and even Rose ‘Russeliana’ – so we know that plants can grow and thrive in these soils. The trick will be to find plants that add to the existing palette to have a garden to show off all year round, instead of the plants going dormant mid-July.
The terraces were rehabilitated in 2009
as part of the West Side Treatment Plan. At the time, we examined historic photos to identify plants that the inmates may have been growing. The photos clearly show gladiolus neatly staked and plenty of unidentifiable low growing mounds. We replanted the top terrace that runs along the parapet wall with Pelargonium ‘Brilliant’, an island survivor. The plantings did well up until last year, when sections started to die out and we eventually removed them all. This year, we are experimenting with a purchase from Annie’s Annuals – Dicliptera suberecta ‘Uraguayan Firecracker Plant’. With deep weekly waterings, the 4” potted perennials are off to a good start.
Bill Noble, Director of Preservation for the Garden Conservancy, visited the gardens last month and this area was examined. Bill visits each of the preservation projects several times each year and lends his expertise and guidance to the gardens. Bill’s perspective is a valuable resource, as often, gardeners need some ‘outside’ advice. Bill suggested tying in the established plantings of succulents on the slopes above the roadway. The succulents would be an ideal choice to give a garden that has year round interest and that is drought and wind tolerant.
Gladiolus will likely not be making a come-back in this garden bed – we can only be impressed with the skills of the inmates to grow such beauties in this tough spot.