The page you linked says the species can be started from leaf cuttings. You allowed them to callus off, and you planted them. Now, you have to wait. It's spring, so they should begin to root within a few weeks, I would think.
Moisten the soil at the time the leaf cuttings are planted, then allow it to dry. The drying stimulates the plant to send out roots in search of water. If the leaf begins to look a bit wrinkled or wilted, it needs water again.