The jade plant is an easy to grow succulent, requiring very little water or attention. Jade plants can grow into small shrubs with thick trunks and branches bearing clusters of leaves ranging from one to two inches long. The leaves are fat, fleshy, oval, and translucent green, resembling the stone jade, from where the plant's name is derived. They are sometimes trimmed in red. It's very easy to propagate tine jade plantlets from these leaves.
Select a leaf from a healthy parent plant and remove it at the stem base by making a slanted cut with a sharp knife. At least 1 inch of the stem should remain. Let the leaf dry for several days.
Prepare a planting medium by mixing equal amounts of sand and potting soil and fill a small pot with the medium.
Press the leaf, flatly, into the soil. The edges of the leaf should be barely below the surface.
Spray the leaf lightly with water to dampen the soil.
Seal the pot in a medium-sized, zip-top plastic bag. Water as needed to keep the soil damp.
Watch for growth within a week or two. You will notice tiny leaves forming around the edge of the leaf. As these plantlets grow, they will send out roots into the soil.
Remove each plantlet, carefully, when it is about ½ inch tall and replant it in its own pot. The roots are quite fragile, so take care not to damage them.