Dip each end into the rooting hormone and place the cuttings in a pot of moist sand and potting mix about 3-4 inches (7.5-10 cm.) deep. Cover with a plastic bag to keep them moist. Rooting usually take s place within 4-8 weeks.Click to see full answer. Subsequently, one may also ask, how do you start a crape myrtle from a cutting?Take 4-inch long cuttings, each with a bud 1/4 of an inch from the top end. They should be about as thick as a pencil. Dip the bottom of each cutting into a rooting hormone and insert the cuttings into a pot filled with a moist lightweight potting soil or soil-less mix.Similarly, how long does it take to grow a crape myrtle from a seed? Place a clear, plastic bag upside down over the pot to retain moisture in the air around the soil. Leave the seed to germinate over a period of two to three weeks. Keeping this in consideration, can you root a crepe myrtle in water? Water the Cuttings Water the crape myrtle cuttings whenever the top inch of peat feels barely moist. Pour water around the base of the cutting and around the outer edge of the pot to encourage lateral root formation.How do you make rooting hormone?Simply add one tablespoon of honey to two cups of boiling water then leave to cool. Additionally, you can use crushed aspirin dissolved in water, or you could make willow tea from willow leaves. A controversial rooting agent which works great is saliva which acts as a natural root enhancer.