Plenty of water, sunshine, fertilizer and, if you're smart about avocados, pine bark mulch and the tree's own leaves left in place. Avocados are strange rascals, and seem to spend their first few years on the verge of giving up the ghost.
Here's a tip for helping your avocado tree survive its first few years. Avocado branches and even the main trunk start out green and are sensitive to sun scald. Later on, if they survive, avocado branches grow a protective layer of light colored bark. But it takes awhile.
Want to help? Mix about a cup of whitewash, made from 50% white acrylic paint and 50% water. Paint the green trunk and branches with the whitewash. Your tree will love being whitewashed and it won't look weird, just more . . . mature.
Avocados are from rain forests. They expect less sun, moist surface soil, and mulch. Keeping their feet cool is priority one. They don't really take off until they get enough foliage to shade the ground around their trunks. Avocados will go to great lengths to make that happen -- putting out branches that go horizontal and rest on the ground. Let them. They know what they need to do.
Soils in Southern California that grow excellent avocados often need a "secret ingredient." It's gypsum. What is gypsum? It happens to be the main ingredient of the drywall in your home. But you will be using agricultural gypsum from your local Home Depot or garden store. You can pay a lot for pelletized gypsum or get it for dirt cheap in a 50-pound bag. Get the later.
When you first plant your tree, put a couple of shovels of gypsum in the bottom of the hold and mix it in a bit. It's not rocket science, just stir it around with about as much soil. Once your avocado tree is established, sprinkle gypsum around the base as far out as the dripline (where the out leaves drop water). Then water the hell out of it.
What does gypsum do? According to soil experts, gypsum leaches out sodium and replaces it with calcium. Sodium in soils binds otherwise beautiful silt into a hard clay-like soil that percolates water very slowly. Gypsum is calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O One form is know as alabaster, very soft and easy to sculpt.
Gypsum in powdered form is magic for soils. With plenty of water - so much that that the gypsum percolates down through the soil - the calcium in gypsum takes the place of sodium.
Soil that was once hard "clay" changes its "tilth" to that of a fine loamy soil that allows water infiltration, air and, yes, the entry of tiny avocado roots seeking out a home.
Of course, "gypsumed" soil is great for all plants but it has especially amazing results on avocado trees. Remember that gypsum parts with its calcium as it leaches out sodium? Surprise! Avocados love calcium (as do many other plants).
Many gardeners know the power of agricultural lime (powdered limestone) to supply calcium in acid soil. Lime or calcium carbonate also raises soil pH, making it sweet instead of acidic. Your avocado likely doesn't need a sweeter soil (it's easy to test soil pH with a kit from the garden store or Amazon. But you probably just need to test once for peace of mind.
I wish it made sense to buy gypsum from Amazon but I doubt it they even carry it. Well I'll be darned, Amazon has everything and at not a bad price, especially if you are a Prime subscriber and get free shipping. See below for your basic ag gypsum at the lowest price I could find. But try your local home store first.
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You can test your soil's texture by putting a sample in a jar of water. Add a few drops of detergent. Shake up the jar and let it stand. Sand will drop out immediately. Silt several seconds later. Clay will remain suspended in the water for hours.
In California, you can buy Avocado trees at home stores and nurseries. Or you can order them by mail. Top varieties are Hass, Pinkerton, and Reed. The size of the tree is not as important as its health.
Your tree will grow to about 20 feet and create year-round shade, so plan accordingly. But this will take many years. You can plant an avocado in Southern California at any time. Dig a hole about 3 feet wide and about as deep. Avocados like well drained soil. If you have heavy soil, add about half a bag of gypsum in the bottom of the hole. I like to mix in compost or soil amendment with the soil. Put a mound of soil in the bottom of the hole, take the tree out of the pot and drape the roots over the mound, like a wig.Your Trees Need Expert Care Too - Florida Tree Service
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