clumping bamboo - rhizomes will not run sideways.
A mysterious vigorous clumping plant.
It has 2 modes of growth. (1)
Large, straight, tall culms. (2)
Shorter, knobby culms. No one has determined what causes the
Sometimes type (1) will turn into type (2), and vice-versa.
Anyway, plants sold with this name
are very mixed in size and habit of growth.