I have a planter in the front of my house that is about 12' x 2 1/2' and I was thinking about putting Oldhamii at each end. Do you think this is enough space? I know they are clumpers but do you think I should have some sort of barrier to keep them in some sort of size control? I was told that I could top them to the height that I want but I kind of hate to do that. I guess I am a little scared of the size but I love the bamboo. I saw them at my Home Depot in a 15 gallon for $75.00 and they were big. They are also at a local nursery for $89.00 in 15 gallon and they were already very tall. I alreay have Black, Golden, Alfonse Karr, Fernleaf and a small Weeping Bamboo and wanted to add a different type. I could use your ideas. Thank you.