Plants of Home and Garden
Sow seed in February, uncovered, keep moist until germination. Light is required for germination, temperatures of 65-70F/18-21C. Grow moist, cool, part shade. Young new side-shoots may be cut off and treated as any basal cutting; will produce new tubers with time
Start tubers indoors 4-8 weeks before last frost, 1/2" deep in humus-rich or peat-based soil and with good moisture, or plant outside around time of last frost. Await the start of the new year's growth before planting, then plant with shallow depression in tuber, where last year's stem was attached, facing up.
Transplant when 3-4" tall, and after all risk of frost is past; large tubers may at this time be cut into pieces, each with at least two buds and healthy roots. If grown in pots, use pots with a diameter of 8" or more. Allow to callus several hours before replanting. Good light, protect from full sun
Bring plants inside before the first frost: after plants have flowered, gradually reduce watering and allow stems to die. Dig up, clean and dry tubers, store in cool, slightly moist peat. Good-sized healthy tubers are essential for overwintering
(rhizomatous begonia, fibrous-rooted begonia, tuberous begonia)
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