Can I propagate a tuberous begonia from cuttings?
Yes. When tubers start to grow in spring they often produce several shoots, and once these are 8-10cm tall you can wiggle the odd one off — best to do the job in conjunction with repotting. Leave the shoot to dry for half an hour then either pot it up or leave it to root in a small jar of water. Large tubers can also be divided or stem cuttings taken from side shoots once the plant has developed, preferably in spring or early summer.