Avocado tree leaves browning

Tips for Rescuing an Avocado Tree When Its Leaves are Turning Brown

Mineral Deficiency

A mineral deficiency can cause the leaves of an avocado tree to turn brown. Avocado trees need iron, zinc, magnesium, phosphorus, potassium and nitrogen to thrive. A deficiency of these can cause the leaves to turn brown. Testing your soil and applying the correct fertilizer can help your avocado tree thrive and produce fruit.

Excessive Salt

Applying fertilizer incorrectly and improper watering methods can cause the soil your tree is growing in to have an excessive amount of salt. A very simple, yet highly effective method of removing excess salt from the soil is to let a trickle of water flow from a hose placed near the tree or 24 hours. This should be done about every four weeks during the summer. This is not to be your routine method of watering your tree. Your regular watering routine should be that you water the tree when the top two inches of the soil is dry. The best method for watering is a hose, placed near the tree, running at a slow trickle for about 2 hours.

Finding the Balance for Optimum Growing Conditions

When you begin reading about how to care for an avocado tree, some of the information may seem confusing. You’ll read that the tree needs sunlight and grows best in full sun, but it can also tolerate partial shade during the day. Balance is the key to growing an avocado tree. The following tips can help you find that balance.

  • The tree grows and produces the best blossoms and fruit planted in a sunny location.
  • Good drainage is essential, yet soil should not be overly dry.
  • Mulch can help retain moisture, but keep mulch about 12 inches from the base of the tree to prevent disease.

Cold Weather

Harsh weather conditions such as frost can cause avocado tree leaves to turn brown. The USDA hardiness zones 9 to 11 are the optimum zones for growing avocado trees.If the tree suffers damage over winter and leaves and branches brown, wait until spring to prune any damage. Many time new growth will sprout from what looks like a brown and dead branch.

How to Save Brown Tipped Plants

Once roots grow soft and rot, they can’t be restored. New roots need to take over. In houseplants, prune away rotting roots, and then repot the plant in new soil for a fresh start. For small garden and landscape plants you can do the same, but for large plants such as landscape trees and large shrubs, roots may need professional help. Your local county extension agent can help you decide on the right route.
Roots that wind back upon or around themselves also signal trouble for potted or landscape plants. These circling or binding roots create a condition known as being “root bound.” This happens frequently in containers that plants outgrow or that weren’t large enough at planting time.
Roots on established potted plants should extend out to where the soil meets the pot, but never wrap around extensively inside. If pots become bound in roots, remaining soil can’t hold enough water to meet the need. Repot root-bound plants into larger containers, but gently loosen the roots with your hand before you pot. This way, roots can grow out into the new soil.
Landscape plants usually don’t have problems with binding roots, unless the problem was there at planting time or soil conditions prevent normal, natural growth. Soil testing and appropriate amendments, paired with a firm, gentle hand to loosen any binding roots before planting, keeps this problem out of your landscape.
4. Scout for signs of fertilizer residue or salt buildup.
Plant tips can turn brown when they’re exposed to too much fertilizer and too many salts build up in the soil. When this happens to potted plants, tips turn brown from a condition known as fertilizer burn or tip burn. In landscape plants, the same thing happens from too much fertilizer or other factors such as winter deicing salts or pet urine. Indoors or out, soluble salts build up in soil, draw moisture away from plant roots and create an artificial drought. As a result, water-deprived plant tips turn brown.
In houseplants, salt buildup shows up as white crust on soil or saucers and on the sides of porous pots. Flushing the soil with heavy doses of water forces salts out and restores normal balance around roots. Just sit the pot in the sink or tub, and water it until the soil is soaked and water runs through. Repeat the process several times to flush the soil thoroughly.
If landscape plants are exposed to over-fertilizing, road salts or heavy pet use, don’t wait for tips to turn brown. Water plants heavily and repeatedly to flush out the soil and prevent tip burn. The heavy watering leaches away built-up salts. If plants start to show brown tips as soil thaws in spring, they may have been exposed over winter. Flush the soil through heavy watering right away.
Avoid fertilizer burn by feeding plants with a non-burning fertilizer, such as Alaska by Pennington Pure Kelp Plant Food 0.13-0-0.6, for gentle, health-boosting nutrients without harmful buildup.
5. Keep recovering plants on track.
Once your plants are back on the path to good health, adjust your care — especially watering — to keep them headed in the right direction. Never water automatically, whether plants are potted or in the ground. Test the soil manually first, by feeling it at an index finger’s depth. If it feels wet, wait a few days and check again. If soil feels dry, it’s time to water. If you use tap water to water your indoor plants, let water sit overnight. This reduces fluoride and other substances that can add to brown tips.
Most plants stay healthiest when watered deeply and infrequently, in your home and your landscape. Water houseplants so all the soil is moist, then let them dry slightly before watering again. If the humidity in your home is very low, a pebble-filled saucer at the plant’s base can help keep tips and moisture in balance.
During active periods of growth, most outdoor plants need the equivalent of at least one inch of rainfall each week, including natural precipitation. When watering, this equals about 5 gallons of water per square yard. Most roots, even on large landscape trees, stay in the top 6 to 12 inches of soil. One inch of water seeps down to that depth in most soils, keeping healthy roots supplied and leaf tips well-hydrated.1
6. Get rid of the evidence.
With your care regimen on track and plants on their way to good health, you don’t need brown tips to remind you of the past. Landscape plants will take care of the problem as the seasons pass, but potted indoor plants can use a hand.
Take a cue from professional interiorscapers — the folks who care for indoor plants in offices and malls — and put brown tips behind you. Use sharp scissors to cut away the dead, brown areas. Just follow the leaf’s natural shape. You’ll still have a thin brown line along the cut, but the rest of the leaf will stay green and healthy as your plant moves ahead.
With a little investigation, appropriate corrections and proper ongoing care, your plants can trade brown-tipped leaves for strong, healthy ones. With the help of the Pennington family of plant care products, you and your plants can get back on the path of good plant health and natural beauty.
Alaska is a registered trademark of Central Garden & Pet Company. Pennington is a registered trademark of Pennington Seed, Inc.
Sources:
1. Cornell University Department of Horticulture, “Soil Basics,” Cornell University.
2. Weicherding, Patrick, “Watering Trees,” University of Minnesota.
Topics: Indoor Gardening, Gardening

Burnt Avocado Leaves: What Causes Avocado Leaf Burn

When the tips of your avocado leaves look scorched but the sun isn’t hot, you may be perplexed. Why are my avocado leaves burnt, you may ask. But avocado leaf burn doesn’t always result from high-voltage sunshine. If you want to understand the causes for burnt avocado leaves, read on.

Why are My Avocado Leaves Burnt?

Avocado leaf burn is fairly easy to recognize in avocado trees. You’ll see dry and scorched avocado leaves, and the damage is especially noticeable around the tips. Leaf burn also causes the affected leaves to fall from the tree well before normal dormancy. The condition makes it look as though extra-hot sunshine has burnt avocado leaves on your trees. But this condition can also appear when the sky is cloudy and the weather is cool or mild.

Given the absence of dramatic sunshine, you

may wonder what is causing the scorched avocado leaves. Burnt avocado leaves can be caused by many factors other than sunshine. When avocado tree leaves brown at the tips and the edges, it is usually associated with an accumulation of salts in the soil.

Dry conditions can also play a role. Dry conditions contributing to avocado leaf burn can include inadequate irrigation. But dry winds can also desiccate the foliage and frost may play a part too.

Preventing Avocado Leaf Burn

How do salts get in the soil? If you live near a salty body of water, the connection is pretty obvious. Avocados are very sensitive to salts, and they accumulate sodium and chlorides more readily than other trees.

A good way of preventing avocado leaf burn is to give the tree regular deep waterings. That washes the salt out of the soil. Forget light irrigation. It doesn’t offer sufficient water to leach out the accumulated salts.

Avocado leaf burn can also be caused by excessive fertilizer applications. Deep watering helps leach out fertilizers too. Be sure to add measured amounts of fertilizer per label directions.

Desiccation can also be reduced or prevented by appropriate irrigation. Many homeowners trying to provide good irrigation place the garden hose near the tree trunk and let it run. However, mature avocado trees have a canopy that spreads far in all directions. The roots extend as far as the canopy and sometimes farther. To water these roots, you need to irrigate at the outside edges of the canopy, not near the trunk.

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