Black Bamboo Shoots
I have a two year old Phyllostachys Nigra growing in a pot, and it put up two new shoots this year. However, they were very thin and drooped from their own weight. I figured that they would harden soon so I propped them up with a stake. After about a month this didn't happen, so I untied them. Within a week, they had died. What have I done wrong, and when do the new shoots become as hard as they normally are? Any help would be appreciated.