re: How do you grow crepe myrtle from cuttings?

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

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Yes. And maybe it's a 2 liter size I bought. I plant my cuttings in a 4" pot, I then set that 4" pot onto a 3 gallon pot.... I have a bunch of pots saved from plant purchases... I fill that 3 gallon with about 1" of soil just so when I set the 2 liter bottle over the 4" pot, I can use the layer of dirt to hold the bottle in place. The Main issue you may run in to is mold developing on the cutting which it's a gonner if that happens. So you don't want an airtight seal around the bottle.