Just like the subject says. My seedlings are planted in a seed starting potting mix in 2 inch deep containers. The plants all have a nice set of spiked leaves growing in and when I do transplant they will go into 4 inch square pots. What is a good n-p-k for a starting fertilizer and when should I start using it? Should I keep the dirt moist at all times or let it dry out before watering? Thanks for the help.