How and When to Fertilize Seedlings
Seedlings should be fertilized when they are two to three inches tall and have two sets of true leaves.
Choose a good quality all-purpose plant food that is designed for vegetable and garden plants.
Start with a diluted strength of fertilizer in the first week.
Bottom watering is the healthiest way to water and fertilize seedlings.
Fertilize seedlings weekly until they are ready to move outdoors to begin hardening off and transplanting.
Keep up with regular watering in between fertilizing
Another option is to fertilize every time you water, but at a diluted strength
Growing strong transplants is the key to growing a strong, resilient garden.