So I decided to make a little cheat sheet for seed starting, based on my experience the last 2 years. The dates listed are growing with a T5HO grow light, in warm room temperatures, with an average last frost date of April 20th (50%).
Onions and Leeks: Extremely slow growing, cold weather transplants
Artichokes: Slow growing and need cold treatment.
Brassicas: Broccoli, Cauliflower, Cabbage, Brussels Sprouts: Fast growing, Cool weather transplants
Sweet Peppers: Slow growing but need everything really warmed up outside.
Eggplants: Grow faster than peppers, also need it really warmed up outside.
Tomatoes: Fast growing and more cold tolerant than peppers or eggplants.
I am also going to try starting basil indoors this year, it had difficulty getting started outdoors and was loved by pests, and can benefit from the extended season especially due to basil downy mildew in the summer. Everything else is direct seeded in the garden.
One of the best seed starting calculators is available from Johnny's
About this site
My name is Peter and I am a gardener in the Lower Hudson Valley. This is my third year growing a very large garden, from seed. This is my journal.