The Q&A Archives: Care of Tuberous Begonia Starts

Question: I've started my tuberous begonias indoors, and the shoots are getting large. Can I pinch them back? I plan to put them outside after the last frost.

Answer: To ensure a strong plant, prune off all but the strongest shoot. Transplant the tuber to a 3-4" pot, and put the pot under bright light. Keep them protected from strong afternoon sun, which can be too much for tuberous begonias. As the plant grows, remove all but one or two side branches. This will result in a hearty plant with larger blooms. Before you transplant your begonias outdoors, harden them off by gradually exposing them to the outdoors over the course of a week prior to transplant. Best of luck!

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