Transplanting apple trees grown from seeds. Since they have 4 or more real leaves they were transplanted to larger pots. To sprout apple seeds place the seeds in a plastic zip lock bag with a damp paper town and place them in the refrigerator for a couple of weeks or more. When you see the seeds sprouting you take them out and place them in pots and keep them moist. Bury the seeds a few millimeters under the soil.
The larger pots were placed in a larger container to control the extra water since they are still being kept indoors to keep them from freezing.