- Fill a small planting pot to within 1/4 inch of the rim with a quick-draining soilless medium, such as equal parts of peat moss and vermiculite or perlite. Moisten the mixture so that it is saturated and then set the pot aside until the mixture dries to barely moist. Do not stick the cutting directly into the soil or you risk removing the rooting hormone, so create a planting hole with your finger, a pencil or other sharp object.
- Use a sharp knife or razor blade to cut the leaf from the hoya plant. Choose a healthy leaf and cut it, with at least 1 inch of the stem, from the plant. Dip the cut end of the stem into rooting hormone and immediately stick it into the soil. If you can't stick the cutting immediately, wrap it in moist paper towels and seal it in a plastic bag. Keep it out of direct sun to avoid drying it out.
- Insert the stem into the planting medium at a 45 degree angle. The hoya leaf requires humidity to properly form roots, so insert the pot into a transparent bag. Use craft sticks or pencils stuck around the inside perimeter of the pot to hold the plastic away from the cutting. Not only will this miniature greenhouse provide humidity, but it helps to keep the soil moist during rooting.
- Although the plastic bag should maintain the moisture content of the planting medium, keep an eye on it and periodically drip some water onto it if it appears to be drying out. Keep the cutting in an area that remains above 60 degrees Fahrenheit and out of direct sun. Depending on the hoya species you are propagating, new plants may be produced around the leaf cutting. Sever the new plants from the mother plant and pot them up individually. You will know that the hoya leaf has rooted when a tug on it meets with resistance.
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