Hairmetal, what is the variety of Crape myrtle you have? That will help us look up the likely genetics.

I really don’t recall. It seems to settle in at max 10 feet high, it has pink flowers that bloom from June on, it has green leaves of a typical size that turn orange in fall.

I realize that probably doesn’t help much.

It may or may not be a dwarf. You really won’t know until they grow large enough to tell, especially since you don’t have the name of the cultivar you are starting from.

I remember it being described as “max ht. 8-10’” but don’t remember the variety.

No way for us to help given the information provided. Have fun experimenting; plant several as each may be unique.