Requires the library mod Collective.
Note: Currently inactive until natural generation is fixed.
Bamboo Spreads is a minimalistic mod which gives bamboo a chance to create a new chute on a nearby block when growing in height. Only bamboo with a minimum height of 2 blocks has a chance to spread.
Configurable
newChuteOnGrowthChance (default = 0.25, min 0, max 1.0): The chance bamboo spreads to an available nearby block when it grows.
How bamboo grows in real life: (credit)
Clumping bamboo. ^
Running bamboo. ^
Some GIFs:
Seeing bamboo spread (with Random Tick Speed upped LOTS for the gif, the mod doesn't change it normally):
Another gif of it spreading more: