I don't believe crape myrtle is considered a tree. It is a perennial shrub, and
of course some can be grown as a tree. My shrub can go as high as 20 feet, but
I cut it back almost to the ground every 3 years of so, and keeps coming back
strong. Right now, i took some cuttings this past spring and they are blooming
for me in 14 to 15 inch baskets, and they are only 2 feet high, because I'm
containing them. I live in NYC and these won't last long outside during the
winter, so i guess i have to bring them indoors and hope to carry them over
till next spring.