I add a lot of top soil around my bamboos.

If only because the rhizomes sometimes emerge
from the ground, in which case I add a layer of
good top soil to bury them again.

I also mulch the ground around and between the
culms a good deal.

Would it be effective to also add some fertilizer
in order to stimulate future and further growth
(spread, height and diameter)?

If so which one?

BTW why do the rhizomes not always stay
underground?


Thanks.