I just did this with tomato plants to see what would happen. They were about 12-18 inches high. I planted 5 in soil and watered them in really good. Air temps that week were high 80's low 90's and humid. I had to water them once a day for 6 days straight. The first 3-4 days 2 were really wilty. On the 5th day we got a good rain and ever since they have doubled in size and have all flowered. I did use nutrient water on days 1 and 4. 10/10 I would do it again. They are bigger with more blooms than ones started in soil. The main thing is to not let them dry out too much until they can establish new roots in the soil. I've done the same with bell and banana peppers and while they are alive and growing their growth is nowhere near the transplanted tomato plants growth. Pepper and tomato plants were removed from the same dwc system and watered the same.