Today we worked in the nursery learning new propagation techniques with Bambusa chungii, focusing on air layering. Air layering is a method used to sprout new roots from the bamboo culm itself, rather than from the root system. First you top (cut the tops off) the bamboo and cut back all the new shoots. Wait a few weeks and then come back to check if new branching has happened below the cut top. If so, then wrap the new branches with sphagnum moss, thoroughly soak with water, and wrap with tin foil. Leave the bottom tight and the top slightly open to collect rainwater.
With any luck, you should see some new root growth after a few months to two years (it depends on the rain, sun, and nutrients). Then cut down the culm below the moss/tin foil blob, trim the new branches that have their own root growth, and repot, making sure to trim extra leaf and branch growth, since the new roots can’t support too much greenery.
After repotting the air layered chungii, we returned to our B. textillis Gracillis from last week and trimmed extra branch growth, to keep from overtaxing the roots.
All photos © 2010 Dan Bloch