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Powdery Mildew Cannabis: How to Get Rid of Them

Powdery mildew cannabis, referred to as white powdery mildew, is from the different kinds of fungi. This looks like white or gray powdered fungus on your cannabis plants leaves.

It shows on both indoor and outdoor grow facilities and is indicated by little bumps on top of the leaves. Common fungi species that pursue after hops will also pursue your cannabis plants. 

What is Powdery Mildew Cannabis?

Powdery mildew cannabis spores can be carried to your plants in the wind, from pets, through air ventilating systems, and other living things that move. Until the nearby environment is excellent, the seeds from powdery mildew cannabis will stay inactive, waiting for their time.

Hence, powdery mildew cannabis can be complicated, and you will not know when it’s hiding and bidding for the right time to attack. It is among the problems that are better to avoid from the start.

The primary issue develops with powdery mildew cannabis when it can grow until it seriously slows photosynthesis and destroys your crop. Therefore, it needs to be chill with as quickly as possible after seeing it. It is not as unusual as other issues, so you must regularly monitor you as a grower.

Symptoms of Powdery Mildew Cannabis 

You know that your cannabis has powdery mildew when you see hairy, powder-like round spots on the leaves. You might notice leaves that look patched, speckled, and withering. The powdery mildew cannabis disease will spread fast to nearby leaves and “devour” all its way.

It is very noticeable as it is stark white in contrast to its green leaves, and can be eliminated if you use the right treatment at an appropriate time. The issue with powdery mildew cannabis is the spores, and usually, you cannot see them as they are scattering throughout the wind, which makes them very hard to prevent and fight. 

Powdery mildew is likely to develop when moisture levels are high (more than 55%) when there’s no air ventilation in the living facility. It also happens when there is an overpopulation of cannabis plants in the grow room and the growing area. If leaves are touching the other leaves, they are more likely to scatter powdery mildew cannabis to other plants, making it more challenging to eliminate when your garden is like that.

In general, powdery mildew applies the junior plants first, scattering around the plant and damaging the buds, stems, and plant leaves. You will see a wet type of odor released by the buds, and this is how you know which buds are affected by the powdery mildew cannabis.

After the mildew has attacked a bud, it can’t be eliminated. If the powdery mold keeps its action plan, it will turn your cannabis plant into yellow color and then become brown, and later on, the plant will die.

You must prevent your plant from coming to this level. Ensure that you are regularly monitoring your cannabis plants and continuously checking for any unforeseen changes in its growth. 

How to Get Rid of Powdery Mildew Cannabis 

Powdery mildew cannabis can have destructive effects on your plants, mainly if it’s not treated fast. Luckily, a mildew disease is controllable. Below is the step by step directions for dealing with mildew cannabis when it attacks:

1. Clean the infected leaves

Clean the infected areas using a high level of pH water. Use water with a pH of 8.0-8,2. This would give the areas livable to fungus spores in a short time if they liked to rebuild a territory.

You can begin by using clean cloth/sponge, or paper towel and cold water. Regardless of what you use to clean your cannabis plants, be sure you throw it once you’re finished. The fungal spores will stay to any kind of material and can scatter to other plants surrounding your garden plants.

2. Monitor the humidity level

Be sure to monitor the moisture levels in your marijuana garden and make sure there are enough ventilation and airflow. The most effective way to get enough air ventilation around your living facility is to use a ventilation system and fans. Ensure your marijuana plants are not closely spaced and that the air is freely moving around the whole grow room, particularly surrounding the shade (which is excellent at catching humid, hot air).

To regulate the moisture, utilize a hygrometer, and be sure you don’t go over this numbers:

  • 65% to 80% for seeds
  • 60% to 70% for foliage plants
  • 40% to 55% maximum for maturing plants
  • 35% to 45% in the last two weeks before yield

Keep in mind that although powdery mildew is a difficult problem, it often won’t attack because your moisture is a bit off. It is usually the combination of humid conditions, poor ventilation, and reduced airflow for the mildew to grow and scatter. 

3. Get trimming if needed

Use a nice pair of horticultural secateurs, trim any dry or browning leaves. This redirects your cannabis plant’s strength, observing as the infected growth will die. Again, eliminate any trimmed vegetation from your plantation fast and throw it to keep the spores away from scattering.

4. Don’t transfer your cannabis

The fungus will scatter to the new soil ground, and you will endanger affecting other plants in your house or plantation. Instead, protect the top part of your cannabis plants with fresh fertilizer. This stops the spores from spreading into your plants when you flush them later on.

5. Cure your cannabis plants and provide prevention

Lastly, you will want to cure your marijuana plants with some kind of fungicide agent. There are ideal options that are simple to use. Most of the antifungal only needs to be combined with water and utilized straight to marijuana plants. Or, you can try curing your marijuana plantation with neem oil. But, don’t bring it to the buds.

Thus, it helps get lesser patches for powdery mildew cannabis to settle and start cultivating. Also, it has the extra advantage of your cannabis plant, saving its energy and utilizing it more effectively for other growths and fan leaves.

Other Methods

Other methods worth using to treat your cannabis plants like oil sprays include garlic oil, cinnamon oil, clove oil, coriander oil, cottonseed oil, or jojoba oil sprays.

Also, you can buy copper-derived applications at any seedbed. Try using one tablespoon of hydrogen peroxide combined with water, which helps destroy the fungi by corroding the cell walls. Another solution is one teaspoon of lemon mixed with one quart of oil, and this process delivers fungicidal compounds without entirely killing the mildew.

Finally, sulfur burners to regulate and prevent mildew. Upon using, be sure you steer clear when the curing is happening because sulfur in people can cause respiratory problems. Once the treatment is done, ensure to clean up every wall and window, so you know any residual substances from the sulfur burner are removed.


If you’re searching for a super-easy way to eliminate powdery mildew cannabis, try using the tap water and paper towel technique. Wet your paper towels and gently clean up the affected leaves, hence, eliminating the mildew cannabis that is present there. Upon doing this, be sure that you don’t excessively bump the cannabis leaves, as it can trigger spores to pass through the air and scatter.

Also, you can add at least two fans in the grow facility to improve the environment and reduce the possibilities of powdery mildew cannabis growth. The fan should be directing air over the leaves of the marijuana plants, and the other one is facing outward from your grow facility. So, the “used” hot air is released from the facility and substituted with new fresh air.

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