Well I just learned today that the first set of leaves to appear after a seed germinates is called a cotyledon. The next set of leaves are called “true leaves” which look much different. True leaves look closer to what the leaves of a mature plant look like.
Once you have at least two sets of true leaves, your seedling is getting ready to be transplanted. I usually transplant most seedlings into small pots and keep them indoors until the soil and air temperatures are just right.
If you need some guidance on minimum spring soil temperatures, just click on the link. When I talk about air temperature, I am referring to whether a plant is a cool season or a warm season plant.
