Stunted Firepower Heavenly Bamboo

by Pat
(Nolensville, TN (Williamson Co.))

My husband bought about 18 Firepower Heavenly Bamboo plants to line our driveway about 2 years ago. Most of them are doing very well, however, there are about 5 that are shorter than the others. They have not kept up the growth with the rest. We have fertilized, trimmed, etc., but nothing seems to help. Any ideas??