Avocados (Persea Americana) belong in the family of Lauraceae. They are native to the tropical Americas, as well as the Caribbean. Also known as alligator pears, avocado trees can grow quite large. Reaching a height of 69 feet is normal. Propagating an avocado seed is relatively easy. Gardeners can place the seed in water or soil. Avocados are tropical plants, so they will grow best outdoors in zones 9 and 10, where freezes are generally not a problem.
Growing an Avocado Seed in Water
Wash the outside of the seed to remove any remaining fruit attached to it. Removing the brown casing around the seed is not necessary for it to root.
Select a jar or other container that is a little wider and deeper than the seed. Use clear glass if you want to be able to see the roots begin to develop.
Stick three to four toothpicks into the center section of the seed, evenly spaced. Place the avocado seed into the container, suspending it from the top by the toothpicks.
Fill the container with water, being sure the top portion of the seed is not submerged. Change the water every other day to keep it clean.
Place the jar in a window that receives bright light during the day. Place the jar outside in an area that receives sunlight for at least half of the day. The avocado seed requires bright light and warmth to propagate.
Transplant into a container filled with a lightweight potting medium once the roots have developed and the seed has sprouted. Avocado seeds will sprout in three to six weeks depending on the warmth and light conditions.
Growing an Avocado Seed in Soil
Fill a one-gallon container with a lightweight, well-draining potting medium that has organic matter in it.
Place the avocado seed into the soil in several inches of soil. Do not plant the seed too deep into the soil, as it may not develop.
Water the container well. Keep the soil moist but not soggy until the seed begins to develop. Water the container when it begins to feel dry. Transplant into a larger container or into the ground once established.