I have had issues with the Big Beef F-1s I have planted the last couple of years. I get a lot of leaf curling during the seed-growing stages and they generally look unhealthy. I spoke to a company rep, and she said that Big Beef need more light than other varieties and she said it could be edema or intumescence. Anyone else have this issue?

I've had lots of issues with unhappy seedlings indoors the last few years. It was very variety dependent - some were fine, but many had slow growth and curled leaves that would eventually fall off. This year I had several that started down that path. I'd been wondering if it might be temperature related as we set the thermostat to about 58F at night. Last year I purchased a large heat mat that I just put under the pots, which did not seem to help. This year I tried again putting the pots on the heat mat but also put large plastic bins upside down over the plants at night leaving about a 1" gap along one edge to allow some moisture to escape. I only plugged in the heat mat at night. The heat mat warmed the air around the leaves under the bins. After a few nights of this, all my sad seedlings looked much better. I continued that process for the rest of their indoor time (~3 weeks), and every seedling looked great. Getting them outside in the natural sunlight whenever the days are warm enough (~60F) also makes a big difference for me.