Fill an individual 3- to 4-inch pot with a sterile, soilless potting medium. Water the medium until it is moistened but not soggy.
Insert the tip of a plastic knife beneath the seedling in the plant tray. Hold the seedling gently by the topmost leaves while lifting it from the soil with the knife.
Insert a pencil into the soil of the prepared pot. Make a hole deep enough for the root system of the seedling.
Set the seedling into the planting hole. Avoid bending or breaking the roots.
Firm the soil around the seedling stem with your finger tips. Mist the soil surface with water to moisten and settle it.