I have several dozen veggie seedlings (summer squash, peppers, beans, eggplant, lettuce, etc) started in propagation trays I ordered from Gardeners Supply. The trays are on my east facing bay window shelf where they get morning sun. Most of the seeds have germinated but many of them, escially the lettuce, chard and beans, are very leggy and floppy. I'm pretty sure it's still too early to put them into the ground. Is there any way at this point to turn them around into more sturdy seedlings?