Answer: Avocados actually grow on trees and thrive in the tropics, so you may have more of a plant than you bargained for!
Right after sprouting and once the sprout has developed two leaves, transplant your new tree into a pot filled with regular potting soil and keep it in bright light (but not direct sunlight at first). Once it has adjusted to being in a pot, move it to the brightest location you have.
When the stem is about 12 inches tall, pinch out the tip to encourage branching. The result will be a multistemed plant. If you don't pinch out the top, you'll get a tall, skinny, leafless stem will foliage appearing only on top.
Give the seedling plenty of light, the brighter the better. You will need to repot it into larger containers as it grows or it will quickly become very unhappy! Fertilize it with the low rate of a liquid plant food periodically. Keep the soil moist but not soggy and your plant should do well.
Enjoy your plant!
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