How do you grow crepe myrtle from cuttings?

Just go grab some seeds from the tree and plant them. My neighbor has crepe myrtle trees and they are always sprouting up in my garden.

All of the above. Take the cuttings in the spring. I buy water in 1 liter clear plastic bottles and cut the bottoms off. Set that over your cutting after you plant it in rooting medium such as topsoil. The bottle is like a terrarium and holds in moisture. Water your cutting everyday for 2 weeks and keep it in a shady place, sun will zap it.

open up the bark at the end of the cutting
dip in rooting hormone
fill a clear plastic solo cup with fine bark mulch that has been thoroughly dampened

place in a cool dark place overwinter and periodically dampen the mulch medium. By spring you should be able to see the roots thru the cup. Transplant when it’s warm

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buy water in 1 liter clear plastic bottles and cut the bottoms off. Set that over your cutting after you plant it in rooting medium such as topsoil. The bottle is like a terrarium and holds in moisture. Water your cutting everyday for 2 weeks and keep it in a shady place, sun will zap it.

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Also very good advice. I've definitely seen people use up to 2 liter bottles with success for larger cuttings. Basically your cutting has whatever nutrients/water were in the xylem, above the cut. Btw, 45 degree angle, right below a node. The "terrarium" allows the plant to take in water via the leaves. That's enough to sustain it until roots can form. The rooting hormone is self explanatory... and the light moisture is to encourage roots to develop, to seek out water. Too much moisture will cause damping or other root rot related failure.

Personally I use peat pellets for my cloning. But something with some water retaining ability and good drainage is what you want to start them off in. Would highly recommend not using a soil with added fertilizer either. Light organics may be fine, but new roots are very sensitive to burning.

Also... since you're new to this, do a small handful of cuttings. Perhaps space attempts out every couple weeks as well. Once you get a feel for it, it's easy peasy. Just takes a little practice to get the feel.

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1 liter clear plastic bottles and cut the bottoms off. Set that over your cutting after you plant it in rooting medium such as topsoil. The bottle is like a terrarium and holds in moisture.

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The bottle goes over the entire cutting, leaves and all? I will have to try that.

Before dipping in root hormone take a butter knife and gently scrape off a 1/2" of the outer "skin".

This will give you more surface area for roots to develop.