Pepper plants are one of the easiest vegetables to grow, but sometimes they get black spots on them. The most common cause is too much sun exposure.

If you can’t move your pepper plant to a less intense area, use dark-colored mulch or other materials around the base of the plant so it doesn’t reflect too much sunlight back onto its leaves.

The aim of this article is to discuss how to prevent your pepper plants from turning black, as well as how to troubleshoot this problem if it occurs. Find out why my pepper plants are turning black and how to fix them.

Why Are My Pepper Plants Turning Black: Causes?

Why Are My Pepper Plants Turning Black

It is important for you to know that there are some causes that may cause my pepper plants to turn black.

Sun Exposure

It is a primary cause of pepper plants turning black. When your plant is exposed to too much sunlight, the leaves may turn black and die.

It will not worsen the problem if you only notice the sunburned spots on your pepper plant after it has already turned black and died. If you see this, then you need to cut down your entire plant next to its trunk and dispose of it properly.

Cold Environment

Pepper plants also turn black when they are damaged by cold temperatures. The most common time for this to happen is during a hard frost or an extremely cold snap in spring or autumn when the nighttime temperature dips below 60 degrees Fahrenheit.

Insect Damage

Caterpillars, aphids, and other insects may also damage your pepper plant by eating away at its leaves. This weakens the plant and can cause it to turn black.

If you see small holes in the leaves of your pepper plant, then this is a good sign that an insect is probably causing it to turn black. Control these pests by handpicking them from your plants when they are still very young and haven’t affected many leaves yet.

Sometimes, pepper plants may have been severely infested with pests before you even noticed them. The only thing you can do is pull up infected plants and start new ones from seed or cuttings so that the pest does not spread to other plants.

Self-Sowing Annuals

Self-Sowing Annuals

Some pepper plants are actually not perennials, but they are annuals. Annual peppers go to seed once the plant has finished fruiting or producing peppers, so this causes it to turn black because it is no longer growing and producing new leaves.

You may also find that your pepper plant turns black if you leave them in the ground after harvesting all of its fruit throughout the season. These peppers will eventually go to seed themselves, which causes the plant to stop growing and simply turn black.

Nutrient Deficiency

If the leaves on your pepper plant turn black, then it may be a sign that they are starving for nutrients. The most common nutrient deficiency in peppers is nitrogen.

The symptoms of nitrogen deficiency in pepper plants include stunted growth and rounded leaves with thin veins that curl under at their edges. This makes them appear somewhat like an oak leaf when you look at them from above.

Iron and magnesium deficiencies can also make your pepper plant’s leaves turn black, but this is not as common as nitrogen deficiency.

Water Stress

Pepper plants may also turn black if they are not given enough water. They do best when the soil is moist but never soggy, as soggy soil can cause root rot diseases that damage your pepper plant and eventually kill it.

Fungal Disease

Fungal Disease

Fungal diseases can also turn your pepper plant’s leaves black. One of the most common is the Alternaria leaf spot, which spreads in wet weather and causes brown or black spots to form on the leaves that gradually increase in size.

Blossom End Rot

Blossom end rot is a common problem for pepper plants. It causes the fruit to develop black, leathery spots on the blossom end. Fruit that has blossom end rot can’t be eaten.

In most cases, blossom end rot develops when plants get too little calcium. Calcium is an important nutrient for pepper plants. It helps them build strong stems and fruit walls, making them less susceptible to diseases like blossom end rot.

In order to prevent your pepper plants from turning black, here are five things you should do:

Properly Prepare Your Soil

Pepper plants need a lot of nutrients to grow and produce fruit, so you will need to make sure that the soil in your garden is nutrient-rich. This means preparing it before planting with compost or other organic matter and then applying a fertilizer every two to three weeks all season long.

Water Them Well

Make sure you’re watering your pepper plants but not too much. The soil should be moist but never soggy. You will also want to keep the plants from getting too hot by shading them on hot days. Also, try to prevent conditions where moisture is likely to collect because this encourages disease.

Pick Off Pests

Keep your pepper plants healthy by picking off any pests you find early on before they do too much damage.

Watch for Symptoms

Watch for Symptoms

Monitor your pepper plants so you can catch any problems early on and treat them before they become severe. Check the underside of leaves, as that is where pests usually start feeding first. You may also want to check the stems and fruit of your plant.

Treat Them Right Away

If you notice pests or diseases on your pepper plants, be sure to treat them right away with an organic pesticide or fungicide. Most of these can be found in most gardeners and nurseries. Just make sure that they label the product for the use of pepper plants before you buy it and then follow the instructions on how to apply it.

Frequently Asked Questions

How to Improve The Quality of Water in My Pepper Plants’ Soil?

Pepper plants do best in well-draining soil that is rich in nutrients. If you water your pepper plants with water that doesn’t contain many nutrients, then the only way to improve its quality is to apply fertilizer regularly.

Is Blossom End Rot Fatal to Peppers?

Blossom end rot is a sign that your pepper plants lack calcium. This is not usually fatal to your plants, but it can cause fruit drop, and the fruit that remains on the plant will usually be in poor condition.

What Does It Mean When Pepper Plants Turn Black?

If your pepper plants are turning black, it often means that the plant lacks nutrients, is being attacked by pests or diseases, or has been exposed to cold.


In conclusion, if your pepper plants are turning black for any of the reasons listed above, you have a fungal disease, blossom end rot, or lack of nitrogen in the soil, it’s time to take action. To prevent this from happening and keep your garden healthy year-round, make sure that you water with nutrient-rich water regularly. You can also apply fertilizer every two weeks all season long and pick off pests early on before they do too much damage.