Brown leaf tips on Plants

Symptoms

Look for brown leaf margins and tips, which are the main sign of this problem. Some tips look brown or scorched. The color varies, because leaves turn brown, gray, dark green or yellow at the margins and tips, or overall. Premature yellowing of the leaves may also occur.

On seedlings, the problem shows up as leaf tip burn. On established plants, the leaf tips and margins are dead. In some cases, affected foliage wilts temporarily or dies and drops prematurely.

The same brown edges are described on azalea, where the problem is called marginal leaf necrosis. Chlorotic and necrotic leaf margins are also described on maidenhair tree, where salt toxicity is the cause. Check whether the browning stays at the tips and margins or covers the whole leaf, since both patterns are listed. So a margin that looks gray or dark green can still belong to this problem. The causes below list what can produce these signs.

Causes

Marginal leaf necrosis is caused by factors such as improper irrigation, poor soil and low humidity. Irrigation, soil and humidity head the list of factors. Overwatering and excessive soil dryness, especially between waterings, are both listed. Underwatering is listed as well.

Too much fertilizer can be a cause, and so can soluble salts in the soil or in the water you use. Specific nutrient toxicities, such as fluoride, copper or boron, are also named. Excess nitrogen fertilization is a cause as well. Salt toxicity is the cause given for the maidenhair tree with chlorotic and necrotic margins.

Too much sun or heat through a window is another cause. A drafty location is on the list too. Pesticide injury and mechanical injury are included. Vascular wilt disease is also listed.

The list includes both too much water and too little, so a brown tip alone does not tell you which one you have.

Diagnosis

Brown or scorched tips and margins are the pattern that marks this problem. Check whether seedlings show leaf tip burn or established plants show dead tips and margins. Then look at the whole plant for the other signs listed: yellowing, wilting and dropped foliage.

Next, compare the plant's conditions with the causes. Ask whether the soil stays wet or dries out between waterings, since overwatering and excessive dryness are both causes. Note whether the plant sits where sun or heat comes through a window, or in a drafty spot.

Think about fertilizer, including any extra nitrogen, and about salts in the soil or water. Low humidity and poor soil belong on the same checklist. Pesticide or mechanical injury is another thing to rule out. Vascular wilt disease is also a listed cause.

Because several causes produce the same brown tips, the leaves alone cannot tell you which one applies.

Treatments

All the treatments on file are cultural, so they change how you care for the plant rather than adding a product. Provide proper cultural care, especially appropriate irrigation. Appropriate irrigation is the one cultural step the treatment facts single out by name. Irrigation matters because improper irrigation, overwatering and excessive soil dryness between waterings are all listed causes.

Avoid unnecessary nitrogen fertilization. Most established woody species do not need nitrogen application to grow well. Excess nitrogen fertilization is itself a listed cause of brown leaf tips. That advice applies to established woody species, so it does not describe every plant.

When excess nitrogen is already present in the soil, increase pruning and irrigation. Pruning and irrigation are paired in that step, so the two go together. Excess fertilizer and soluble salts are also listed causes, so feeding is worth reviewing alongside watering. No organic or chemical treatment is recorded for this problem.

Prevention

Prevention comes down to the conditions the plant lives in. Appropriate irrigation is the condition the treatment facts stress most. Avoid overwatering, and avoid soil that becomes excessively dry between waterings, since both are listed causes.

Skip unnecessary nitrogen fertilization, because excess nitrogen is a listed cause. Keep humidity from running low and avoid poor soil, because low humidity and poor soil are named causes. Place the plant out of drafts and away from too much sun or heat through a window.

Watch for excess fertilizer and soluble salts in the soil or water. Specific nutrient toxicities such as fluoride, copper or boron are also on the list of causes. Protect leaves from pesticide and mechanical injury.

Plants most often affected

Records for this problem name five plants: azalea, ginkgo biloba, hackberry, clematis and coast redwood. Marginal leaf necrosis is described on azalea. Salt toxicity is described on maidenhair tree, with chlorotic and necrotic leaf margins. Hackberry, clematis and coast redwood are also on the list of affected plants.

No plant page in this build records this problem yet.