This week was a turning point in spring with the Chasmanthe floribunda being cut back on the west road terraces. After blooming in February, the leaves of this South African bulb is left is photosynthesize to store energy in the bulb to bloom next spring. Like other bulbs, such as tulips and daffodils, the leaves should be left until they die back completely; however, on the west road terraces, the chasmanthe is cut back just as the tips are starting to turn yellow.
Why do we cut the foliage when they are still green?
The leaf stalks are cut to the ground and which are then cut into 4” pieces by volunteer crews. The pieces will be composted and break down much faster if they are cut when they are still green. The moisture content in the leaves helps them break down much quicker than if they were brown and dry. We have experimented in past years with letting the foliage die back completely, then cutting it back and feeding it through our chipper. Not only were the dried leaves hard to cut with hand pruners; but the dried leaves wrapped around the chipper blades; which then lead to hours taking the chipper apart and sharpening the blades.
This week, method – a company that is dedicated to producing earth and people friendly cleaning products – volunteered in the gardens and helped with this yearly task. A fun bunch, the group enjoyed views of the Golden Gate Bridge while they worked.
One lucky employee, Jonathan McCarren even found a very rusty trowel with the wooden handle rotted away. Jonathan’s find will be passed onto the National Park Service archives and his name will become part of the records. The group speculated what the inmate who last touched it had being doing and why the trowel had been left behind?
Fitting for a cleaning company, they swept the roadway after they were done and left the gardens pristine.