Transplanting bamboo dug up with barely any roots?

I dug up a group of 4 bamboo culms from my neighbours yard, and 3 have barely any roots since we dug with a pickaxe and forced it.... The bottom has about 2 inch radius of roots for a 15ft culm. Two of them are connected so that may help or not. One of them has about 6 inches of rhizome. They're all about 15ft or so and I planted them in a mix of clay and horse manure in a 2ft wide bucket. Any ways to help ensure it roots and survives? Do I prune them now? It's Spring here in zone 7B with nightime temps around 40F and daytims occasionally reaching mid 60's. I have it supported against the branches of a pine so it's partially shaded.

machotti12014-03-25T23:37:42Z

Favorite Answer

Pant in soft soil with hole margins protected to keep the bamboo in one place. Surround the hole with plastic to line the hole & margins approx 12 " high inside around hole in the area to maintain roots from spreading and taking over the whole area. Bamboo will root readily keeping the soil damp not soggy to cause rot at all times. Trim any growth from the culms to approx. 3", then the plant can expend energy on rooting then after a few months will send up shoots. I started with 12 culms. Within 4 years the area of 4'x15' is thick & lush all season long, clump black bamboo. Bamboo loves to send out long underground rhizomes which can pop up any place in the area if not contained in a built in pot in the ground keeping the roots in check. Nurseries carry special materials just for this purpose.