Black spot plants: What are the main reasons and fix it

Black spot plants: What are the main reasons and fix it

To help you out and answer your question about why do black leaves get on some of your plants, we’ve put together this simple guide so you can learn more about the possible causes, how to eliminate them, and how to prevent the appearance of stains, on the leaves of plants. Its appearance is usually the first symptom of some type of black spot plant, which is reducing the health of the plant.

We encourage you to take a look at this article about why black spots appear on the leaves of plants to keep your plants free of these because, in addition to giving them a bad appearance, they can also end up with them. If not, they are given the corresponding treatment.

Causes of black spot plants

Although black spots are usually related to fungi on plants or the onset of plant leaf diseases, it may be due to other factors. These are some of the causes that the leaves of your plants have black spots:

black spot plants

Natural death of leaves

You should know that even in the case of perennials, the leaves have a limited life expectancy. The leaves may show this aspect because they have completed their life cycle and not because of the presence of any disease.


It is the result of placing the plant in direct and continuous exposure to sunlight. This can be increased if you also water your plants during the central hours of the day. To avoid this, we recommend that you move your pots during the hours of greatest sunlight and that you water them using a sprayer.

Considering these cases that occur naturally or due to a bad location of your plants, we are going to talk a little more about fungi in plants. These are undoubtedly one of the main causes that the leaves end up with those annoying black spots damaging to their health.

Appearance of fungi

Fungi appear when the plant is exposed to excessive humidity. They are spots that initially take on a brownish color, to finally end up with a dark color. In addition to its rounded shape, it is easy to recognize fungi’ presence by the appearance of aphids, tiny insects that are attracted by the sweet taste of the leaves and flowers that are exposed by the action of the fungus. It is advisable to treat the pest before eliminating the fungi to ensure that the treatment used will be completely effective.

How to remove black spots from plant leaves?

Next, we will give you some basic tips to know how to treat your plants that have black spots on the leaves. In most cases, as we have already mentioned, it will be because of the appearance that we have focused on how to eliminate fungi from the leaves.

black spot plants

Step 1: Remove infected leaves

To ensure your plant’s health, the first thing you should do is prune all the infected leaves as quickly as possible since fungi spread through direct contact. Ensure that the tools you are going to use for this treatment are disinfected every time you cut a new blade. You can use a liquid solution made up of one-fifth of bleach and four-fifths of water.

Step 2: Treat infected areas

To avoid cutting all the plant’s infected leaves, especially those that already have a yellowish appearance, we can try to recover them using some remedies to prevent the disease from spreading. The simplest thing is to use fungicides, but we want to remind you that they are made with an organic compound base whenever you buy this type of product. You can also use neem or neem oil or prepare other home remedies to spray the leaves periodically.

Step 3: Rake and discard infected leaves

In case your plants are indoors, we advise you to always keep the soil as aerated as possible and remove all infected leaves. Place these in a tightly closed bag to throw them away and prevent agents such as wind or animals from spreading the fungi again.

Why the tips of the leaves turn black?

Usually, when only the leaves’ tips turn black, it can be due to excess moisture in the soil, either due to poor drainage or overwatering.

However, the appearance of black spots on the leaves is due on the vast majority of occasions to the appearance of fungi in our garden, crop or pots. Once fungi have appeared, they can be quite difficult to eliminate, so prevention is always more appropriate than cure, as popular wisdom says. These are some measures you can take to prevent the appearance of fungus on your plants :

  • Keep the plant in an airy and dry area unless it is a species that does not tolerate drafts or expressly requires high humidity.
  • Provide a substrate rich in nutrients that give the plant strength to fight against fungi and diseases. A vermicompost is a great option as a fertilizer, ecological and very rich in healthy microorganisms.
  • Always water your plants by adding water to the substrate and trying not to wet their leaves or flowers. These parts tend to be susceptible to fungus or disease growth if kept moist for too long, and most plants only need water in their substrate or soil.
  • Make sure the substrate is light and offers good drainage. If you have the potted plant, make sure the container has drainage holes and that you remove any excess water about 20 minutes after watering from the dish below.

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