Today was one of those reasons I put up with the long winter. A clear blue sky and the beauty of the earth waking up.
It was over 50F between 12 noon and 6 pm, so ALL my seedlings got to sunbathe. 50F is my minimum temp for mid-range vegetables: tomatoes, basil, marigolds, etc. For cold-weather vegetables like onions, cabbage, lettuce etc., 40F is fine. Hot weather seedlings need 60-65F. Eggplants and peppers are hot weather veggies, but today was so lovely I put these out too.
I have seven trays of all sorts of veggies and flowers. They are growing well. The cabbage leaves look great, tomatoes leaves are very dark green and healthy looking, marigolds have fat flower buds (!), onions growing slowly but looking good so far.
Cold-weather seedlings, 40F minimum:
onions, cabbage, lettuce, escarole, arugula, spinach, broccoli, celery, celeriac, parsley, beets, kale, thyme
Mid-range veggies, 50F minimum:
tomatoes, basil, marigolds, cosmos, heliotrope
Hot weather veggies, 65F minimum:
eggplant, peppers, squash, beans