Leaf Propagation
The propagation of plants by their Leaves is a method of rapid increase adopted with great advantage in the case of those which succeed. An incision made in any firm part of the midrib, as well as the petiole, will, in certain instances, induce the production of a young plant. Ornamental-leaved Begonias, Gesneras, Gloxinias, and several succulent plants, are familiar examples of subjects largely increased by Leaf Propagation. Doubtless, many other sorts of plants might be similarly perpetuated, if their leaves remained fresh for a sufficiently long time to enable a callus to form. Leaves which are nearly fully matured, but still not too old, are preferable for propagating purposes; they will not succeed at all if very young. Merely pegging them on light soil, or covering very lightly, for preserving moisture, is generally sufficient, with the protection of a close frame or bell glass. Succulents, increased by Leaf Propagation, should have their fleshy leaves simply laid on or very lightly pressed into sand, and be kept nearly dry on a shelf until a small bulbil-like plant forms at the end each, where it has been detached. The propagation of plants by leaves is generally limited to the petiole or ribbed portion. Bryophyllum calycinum is, however, an exception, as young ones spring, in this case, from the notches on the margin of the leaf.