Prick out young seedlings
Lift seedlings from the pots they were sown in once they’re large enough to handle, and replant in deeper pots of richer potting compost. Space them further apart, so they have room to grow. Hold them by a seed leaf and make holes with a dibber in the new pot. Firm in and water gently. Keep in a warm, bright spot indoors to grow on, until they’re ready to plant out.