Make new begonias
Cut a few new leaves with their leaf stalks intact from a begonia houseplant to make leaf cuttings. Fill pots with propagation compost, firm and water. Take a leaf and trim the leaf stalk down to 2-5cm. Use a dibber to insert the stalk into the compost and firm it in with the leaf just at the surface of the compost.
Cover with a plastic bag or propagator lid and put somewhere warm to root. A tiny new plant will emerge from the base and the old leaf can be cut away as it grows.