I want to plant a mimosa tree-but I don't want it to get to it's max. size of 30-40' and same width.Is their a way to restrict the size?

Dear peace

Just a case of pruning. Specially the growing top of the tree, as soon as it reaching the by you required max. height. The same for branches.

Success

I am glad that I found your question. I have seen these trees from time to time but never new any information on them. The only information, which now I understand is, I was told to be careful of where and how you plant these.

Texas Invasives - Albizia julibrissin

Here is also a link which may also help. What I found was that mimosa is only a herb, not a tree at all. I now understand the reasoning behind using the botanical name as a reference.

Mimosa Tree - UBC Botanical Garden Forums

Honestly, if you don't have room for a mimosa tree to grow to it's potential size, I wouldn't bother with it. Trying to keep a plant smaller than its normal size can be a real headache. Can you find another location if that's what you really want? As far as the Albizzia julibrissin (Mimosa) being considered invasive in Texas -- I can totally understand it. But I live in the Midwest and they are a bit touchy here. If we have a hard winter when the tree is young, it'll usually die back to the ground but sprout multi-trunks the next spring. The Mimosa won't take up as much room if it's grown as a single trunk rather than a multi-trunk. Incidentally, the Mimosa is called a Silk Tree in California.