Carol, I have that "spindly" problem with Brassicas in particular... even when I direct sow them outside in full sun. It almost seems like part of the root is above ground. I do plant them a little deeper when I pot them up (or transplant outdoors). If anyone has anything else to offer in that regard, I'm
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I like planting my seeds in 6-packs (2-3 seeds to a cell, then thin to 1 plant; unless I only have a few seeds, or expensive seeds, then just 1 to a cell and no thinning) rather than a bunch together in a container... I find it easier to transplant them, but that might just be me.