Question
QUESTION: I live in Kansas.  What is the best way to plant an avacoda pit?  Should I start it in water first or just put it in a pot of soil first?  Can it just be put in the ground outside first?  Can it be left outside over the winter?  If I start it in a pot or when I put it in a pot how big should the pot be? Will it need to be moved to larger pots as it grows?  How much room do I need for the roots  Just before I wrote this I read here about someone planting one and I thought my granddaughter might enjoy doing this and watching it grow.

ANSWER:   
Cut into your avocado carefully, so as not to injure the pit located in the fruit's center. Carefully remove the pit, and set it aside. Use the avocado meat to create the tasty dip/topping known as guacamole.
Gently wash the avocado pit, removing all avocado flesh from the pit.


Holding the pit "narrow" (pointed) side up, stick four toothpicks into the middle section of the pit at even intervals, to a depth of about 5 mm.


In a small, slender container (preferably glass), add water until it reaches the very top rim. Your container's opening should be wide enough to easily accommodate the full width of the avocado, but not too much wider.
Set your avocado pit (with inserted toothpicks) on the top rim of the container. The toothpicks should sit on the rim of the container, while keeping the pit only half-submerged in the water.


Set the avocado-topped container in temperate, undisturbed place--near a window or other well-lit area--to begin the rooting and growth process.
Change the water every 1-2 days to ensure that contaminants (i.e. mold, bacteria, fermentation, etc.) do not hinder the avocado sprouting process. Ensure that the base of the avocado always remains moist and submerged in water.
Remember: Wait patiently. The avocado takes several weeks to begin to root. Over the next 2-3 weeks, the avocado's brown outer layer will begin to dry out and wrinkle, eventually sloughing off. Soon after, the pit should begin to split open at the top and bottom. After 3-4 weeks, a tap root should begin to emerge at the base of the pit.
Continue to water the plant accordingly, being careful not to disturb or injure the tap root. Continue to allow the avocado pit time to establish its roots. Soon, the avocado will sprout at the top, releasing an unfolding leaf-bud that will open and begin to grow a shoot bearing leaves.


When the roots are substantial and the stem top has had a chance to re-grow leaves (after at least one pruning), your baby avocado tree is ready to be planted in soil. Remove the sprouted pit from the water container, and gently remove each of the toothpicks.
Use a 20-25 cm terra cotta pot filled with enriched soil to 2 cm below the top. A 50/50 blend of topsoil and coir (coconut fibre) works best. Smooth and slightly pack the soil, adding more soil as needed. Once the soil is prepared, dig a narrow hole deep enough to accommodate your avocado's roots and pit.
Carefully bury the avocado pit in the soil such that the top-half of pit shows above the surface of the soil. Pack the soil lightly around the pit.
Water your plant daily or enough to keep the soil moist. Avoid over-watering to the point that the soil becomes muddy. If the leaves turn brown at the tips, the tree needs more water. If the leaves turn yellow, the tree is getting too much water and needs to be permitted to dry out for a day or two.
Continue to tend to your avocado plant regularly, and in a few years you will have an attractive and low-maintenance tree. Your family and friends will be impressed to know that from an avocado pit, salvaged from your guacamole recipe, you have cultivated and grown your very own avocado tree.



Tips   [edit]During the winter or in cold climates, it is best to transfer the baby avocado tree into potting soil in a medium flower pot rather than directly into the ground. Keep the plant in a sunny window and keep the soil moist but don't over-water.
As with many fruit bearing trees, the avocado tree requires two separate avocado trees to allow cross-pollination and begin to bear fruit. As an option to growing two avocado trees from pits, you can purchase a second "real" (fruit-bearing) avocado tree from your local plant and tree nursery. You might also consider grafting a branch from an existing fruit-bearing tree to your home-grown root stock (tree grafting, however, is another process all unto itself).



Warnings   [edit]In the rooting processes, the greatest dangers to avoid:
Letting the pit's bottom tip dry out will most likely prevent the avocado from sprouting properly, if at all.
Not changing or adding water insufficiently to the sprouting avocado pit can allow contaminants to form in the water and/or on the roots. Molds, root rot, fungi, and fermenting water can quickly poison the entire plant. Keep the water fresh and at the proper level.
Over-pruning (too much or too often) can stunt or stop leaf growth. After the first pruning, cut off only the very end leaf-buds on the stem and/or branches. For tree limbs and main stem trunk, pruning promotes both fuller branches and thicker, stronger leaves.
Once planted in a pot or planter, over-watering will quickly begin to turn your plant leafs yellow. Water only as much needed to keep the soil moist. Under-watering will shock your tree, and the leaves will begin to curl back and turn black. If either situation is not corrected promptly, your avocado tree may have a slow or unsuccessful recovery.
Cold (below 10 degrees C) can also shock your avocado plant. Keep your plant away from cold breezes, breezy doorways and cold window panes. If your tree is potted, keep it indoors until the temperature rises. For young, ground-planted avocado trees and most potted avocado trees, cover the plants leaves completely with a blanket or heavy plastic during cold weather, at least until warmer weather prevails. Well established avocado trees can often survive mild frosts and temperatures near freezing. The best bet: Always cover your tree when in doubt.
Thin or spindly branches and stems make for a weak plant support foundation. Failure to prune often enough, can create long, winding, weak branches and stems. Pruning allows the tree stem to thicken and grow more rigid.
Low lighting and/or improper watering can also create week stems and branches, which ultimately will cause the plant to collapse under its own weight.
Until the tree is well-established in a pot, do not plant it directly in the ground. A strong plant root system along with well-loosened ground soil make for a good outdoor planting situation.
Growing an avocado seed in this manner does not result in fruit identical to the parent; it will be identical to the substandard avocado tree onto which your edible variety was grafted. It will provide first rate shade, however.


---------- FOLLOW-UP ----------

QUESTION: Thank you for all the information.  I am very anxious to try this, so when my granddaughter gets back we will see what we can do.

Exactly how do we do the first prunning?  When do we do it?  Then do we continually prune after the first prunning or how often do we prune then?

As this plant goes larger do you need to repot it?  Does it grow according to the size of the pot you put it in?  I have heard that is what some plants do.

Again thank you for all your information.

Answer
Only prune it if it looks like it needs it, to keep it shape attractive.
It will need to be repotted when the roots fill the pot, and wind around in the bottom of the pot. Pot it up to the next size bigger pot. It is a tree. It will just keep growing until it is 40 or 50 feet high, and wide.