How do you grow crepe myrtle from cuttings?

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Is there a certain process you have to follow immediately after getting a cutting?

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I use a rooting hormone. I grow other plants that justify having an expensive cloning gel, but the powdered varieties available at box stores should suffice. The medium you plant them in needs to stay moist, but not drenched. Best 2 tips I have for you.

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

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.