Unless you use bone meal ;) minecrafters will understand
Why 'do not grow quickly' instead of 'are not growing quickly'?
Is bamboo a tree? Anyway ok, added.
Bamboo is a grass / trawa :D
Bamboo is a weed
Fast NOT OK. Same as quickly.
What's ok then?
I have the impression that Reinier might have meant that "fast" wasn't considered ok by the app despite meaning the same as "quickly". But in fact, "fast" is listed as an accepted answer and it should have worked.