For larger plants we use a double ring. On some of the really large diameter bamboos you may want to put a line to two that bisect the diameter of the plant. During the first season of growth we recommend using a fertilizer with a Nitrogen value of no more than 10. After the plant is established, higher Nitrogen amounts can be used safely. Whatever formula you choose, be careful with Boron - it should only be used in very low dosages.
Healthy soil is our greatest resource for healthy plants.
Compost and mulch result in healthier soil, healthier plants, and ultimately in less work. Starting after the second summer of growth, it is good for the bamboo to be thinned out a bit. Canes within the clump will eventually die and decompose, but the clump, as a whole will most likely continue with vigor. You can thin the clump each year carefully making sure that there are no canes over 3-4 years of age. The 3-4 year old canes are at their peak of strength if you are interested in using them for any kind of craft or construction purpose.