When a seed sprouts, the first set of leaves that unfold are called cotyledons. All the food that’s needed to sustain these first leaves is contained right inside the seed. These leaves are unique and often don’t resemble the leaves that come after, often called true leaves.
Once the second set of true leaves appears, you should begin feeding your seedlings. Young seedlings can’t tolerate full-strength fertilizer, so you should coddle them with a half-strength dose until they are three or four weeks old.
What kind of fertilizer should you use? We recommend Plant Health Care because this balanced formula contains a 6-12-6 fertilizer, plus humus, amino acids, and vitamins to make seedlings stocky and disease-resistant.