Tom8, I'd go ahead and put them in soil. The roots need to develope root hairs to absorb water from the soil and they'll start trying to form them as soon as you have air and soil touching them. So the sooner you do that the sooner they'll get over the transplant shock.That being said....If Butch has a different opinion listen to him, I'm a plant person but he's a begonia person. Anita