Next comes the hard part - thinning. Since you planted several seeds per container, you should have several seedlings. Choose the strongest, healthiest looking seedling in each container and cut the rest with a pair of sharp scissors. Since you want plants that produce the most flowers or veggies, there is no sense in attempting heroics to rescue a weak seedling.
As the seedlings get bigger, you may have to move them to bigger pots in order to keep their growth momentum going. In May, you will need to prepare your plants to be transplanted. This process is known as hardening off and I'll write about that during the spring!
Anne Lenox Barlow has had experience in the agricultural field as a horticulture educator with Cornell Cooperative Extension in Clinton County. She can be reached by e-mail at firstname.lastname@example.org.