Bulbs: Tuberous Begonia Question, 0 by kdjoergensen

kdjoergensen wrote:
Sometimes it can take a very long time for tuberous begonias to sprout. I pre-start them indoors in pots with 70F bottom heat. Until soil warms in your area, it is not going to be fast.

I would cover them with atleast 1" of soil because tuberous begonias form roots on all surfaces of the bulb and if you do not cover it, it will not form roots.

Just continue to keep the plant just moist (but not wet) until the sprouts are 3-4" above ground. Then you can water more regularily; and start to fertilize.