Bambusa textilis is probably as big as you can find in a clumper for Dallas. Should be good to high teens. Even with culm death from a long hard freeze, heavy mulching should protect the underground bits.

Some of the Bambusa multiplex will probably do better, but they don't get very big.

I have a Bambusa tuldoides clump which is about the same size but a couple degrees less hardy than B. textilis and that has survived low 20s with no leaf death. It has sized up quicker than any of my Phyllostachys. Planted in July 04 as two culms from bamboobend.com, I got 8 or 9 20-ft culms in the summer of 05. A couple biggy shoots that are coming up now will probably get to 30 ft. Will have to prune a mesquite tree to give it headroom. Bigger leaves than all of my Phyllostachys.

Thanks man.. the oldhammi is not going to make it more than a bush.. the pic I have is old on the web site.. the culms that came up this year are smaller than the original plant!

I went with Bambusa multiplex 'Alphonse Karr' as I liked the color.. so will see how this does.. just have to figure out what to do with the Oldhammi, grown into a large bush right now.. Maybe just mix the two together??