Hi! I have 4, 30 gallon planters of bamboo on the balcony of a townhome located in Santa Monica. Over the past month of owning them, around 70% of their leaves have turned yellow and fallen. The guy I bought them from said to water once a week until water comes through the bottom of the planter. Then twice a week once acclimated. This doesn't seem to be working. Any help would be greatly appreciated!!