Make sure your seed starter mix is light and fast-draining.
Plant seedlings so that the soil surface is near the top of the container to insure proper air circulation.
Sow seeds thinly to prevent over crowding which can lead to humid, moist conditions.
Seedling trays that provide water from below are preferable to overhead watering.
Never water past noon so that the soil surface and the plants are dry by evening.
Avoid overwatering tender seedlings.