I have managed to keep my tomato seedlings from getting long and stringy (leggy) this time, but they are turning purple on the bottom of the leaves. Now, in the little reading I've done, this seems to be either too cold, or not enough phosphorus. Is this correct? Would simply putting them in a warmer spot (with light) remedy this, or do I need to give them some other help. As I am trying to keep this organic (and cheap!) anything I add should be organic. I planted them in a seed starter that is compost, vermicompost, and coconut coir. It says .65% nitrogen, .25% available phosphate, and .15% soluble potash if that makes any difference.
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