Yes, you can propagate Haworthia from leaves. Select a healthy leaf from the plant and carefully remove it from the stem. Allow the leaf to dry for a few days until the cut end calluses over. Then, place the leaf on top of well-draining soil, making sure it is in contact with the soil. Keep the soil slightly moist and place the pot in a bright, indirect light location. After a few weeks, you should start to see small plantlets forming at the base of the leaf. Once these plantlets have grown a few roots, you can separate them and pot them individually to grow into new Haworthia plants.