You should start feeding your vegetable and flower seedlings with a mild dose of fertilizer when they have first sets of true leaves. It is because the nutrients required for the seedlings to develop the first set of leaves, called 'Cotyledons,' are already packed in the seed embryo.
When should I start feeding my vegetable plants?
Feeding is usually done in spring or summer, during the growing season. Few plants need fertiliser in the winter months, even if they are winter-flowering.
When should I start giving my plants food?
Start feeding early.
To get the best results, begin feeding your plants in early spring so they have the nutrients they need to start the growing season off strong. Continue to feed on a regular basis according to label directions.