I agree--transplanting and finding room under the lights is always an issue for me. The next battle is being able to get everything outdoors to get hardened off--our spring weather can be so unpredictable. I spend a LOT of time moving flats of plants inside, then back out, (rinse and repeat many times).
I grow a lot of plants for our Master Gardener plant sale in May. I'm always so glad to see those plants out of my house by then!!!
