Is this the same for Black Bamboo

Phyllostachys Nigra is black bamboo.

what did you feed it as ours has only grown inches in a year

This plant can be slow to establish itself .. yours may just be taking more
time to bed itself in, especially if you planted it as a small plant. It
needs feeding and watering well, especially in the first year while it is
finding it's roots.

Best,

- h