Prepare a mound 2 feet high and 6 feet wide made of a mixture of sand, native topsoil and if necessary, some completely composted organic material. The idea is to build a well draining mound. Were not talking about a $150 hole laced with Kelp and B-12, green sand, spirulina, time release osmocoted, pelletized organic magic grow powder. We just want to raise the tree roots up above the normal grade, reducing drainage problems during periods of heavy rain. Fertility will leach down from the composting mulch and manure/fertilizer you pile on the surface. So just do what you need to achieve drainage, not more: if your soil is naturally sandy and light, for instance, don’t bother adding more sand. No fertilizer, fresh compost, or uncomposted plant material in the mound. Dig a hole 2 feet deep into the mound.
Open the packing box out of the direct sun.
Water the tree immediately.
Place the tree in its grow-box directly into the hole. Set a 3-4 foot stick of bamboo, 1/2″ thick in the ground next to the root to act as a support for the baby tree.
Gently open the seam of the the box and remove, fill the hole until the soil is level with the top of the root ball. Leave a slight basin (about 18” across) at the top of the mound to water into.
Water the mound thoroughly and settle the tree in place.
Cover the entire mound with at least 4 inches of mulch, except for the basin around the tree, which should remain only lightly mulched.
Spread up to 15 pounds of gypsum (sold at most nurseries) over the mulch and water it in.
Sunburn is a potential problem. Paint exposed bark with diluted white latex paint or kaolin clay (Surround). If your tree has few leaves, put a tomato cage around the tree and drape a piece of light row crop cover over the cage to filter the sunlight until some more leaves emerge.
Water thoroughly twice per week until the fall rains take-over. The tree should be kept damp but not saturated. The tree should never be allowed to dry out completely.
It is preferable to apply an organic fertilizer (composted manure is best) at planting time and several more times until the end of summer. Stop fertilizing before winter.
Avocados enjoy a layer of leaf debris shading their roots; don’t clean under the trees: let leaves accumulate, and add a few additional inches of mulch each year. Allow the mulch to smother weeds: the avocado mound should remain weed free.
Photo Essay: How to plant an avocado tree.
Move soil to create a mound about 18 high and 4-5 feet across.
Dig a hole in the top of the mound that will be large enough to fit your tree’s root ball.
Place plant in the hole. If in a plastic pot. tip it carefully into your (or a friend’s) hand and place it gently in the hole. If necessary to preserve the roots, sacrifice the pot by slitting down the side with a utility knife.
Gently remove the pot from around the tree.
If the weather is hot and sunny, you might want to shade the tree (we are using row cover in the photo) to protect it during its first few weeks in the ground.