4 Easy Steps On How To Clean Grow Room After Powdery Mildew

Use Hydrogen Peroxide or any commercial cleaning agents to wash the plants. This method is the best way how to clean grow room after powdery mildew. 

Grow rooms are popular with people who want to grow their own plants. Sadly, indoor conditions can make the room prone to excess moisture.

how to clean grow room after powdery mildew

This moisture is what leads to mold and mildew growth. Powdery mildew is the most common because it primarily targets plant leaves. 

Here are some straightforward tips for managing powdery mildew once it grows. 


All About Grow Rooms

Controlled horticulture is a popular hobby for some homeowners. Converting an unused room or an old tent to a grow room is straightforward and beneficial.

You can raise any plant in a grow room, but the most common choice is Cannabis. This plant has several health benefits when it’s consumed for medicinal purposes. 

People prefer grow rooms because they are easy to maintain. You can control the amount of temperature, light, and humidity your plants receive, so they will be healthier. 

The only downside to grow rooms is that they’re prone to common plant pests. One of those is powdery mildew. 


What Is Powdery Mildew?

This white fungus is a common pest on plants. Powdery fungus comes from the spores of Erysiphe graminis, and it thrives by clinging on to a living host.

Powdery mildew prefers to grow in a warm and dry climate, and it can survive up to 27 degrees Celsius of temperature. 

This fungus still needs humidity to thrive, though. That’s why it usually targets indoor plants. 

Plants kept in the shade are more susceptible to powdery mold growth because they don’t get any direct sunlight. 


How To Spot Powdery Mildew Growth On Your Plants

Before you start cleaning, you need to ensure that your plants really do have powdery mildew and not just an aphid infestation. 

This article will help you know what does powdery mildew look like. There are other ways to determine if your plants have powdery mildew on them:

  • If you notice circular and powdery white spots, that may be an early onset of powdery mold.
  • Your plant leaves may look like they’re covered in flour; it has a fine powdery texture to them.
  • This fungus usually grows on the top part of the leaves, but it can appear on other parts too.
  • Some leaves might become disfigured and even break because of the fungus.
  • The powdery fungus can also make young plants’ leaves dry out. These plants are the most susceptible to infestation. 

Knowing how to identify the powdery mildew can help you clean it more efficiently. 


Step-By-Step Process How To Remove Powdery Mildew From A Grow Room

Now that you know what the mold looks like, you can start cleaning it off. Cleaning powdery mildew indoors is similar to dealing with it outside on your grass lawn.

Here’s a guide on how to treat powdery mildew on grass. Now, it’s time to start cleaning your plants!


Step #1. Use hydrogen peroxide to wash the leaves

Mix this chemical with equal parts of water, and wipe the leaves to remove the mildew. Hydrogen peroxide can kill fungus down to its roots, so it’s a wise choice. 

Other natural ingredients that can kill powdery mildew are baking soda and milk. 


Step #2. Check your vents and filters

Once you’re done cleaning the plant, check if the surroundings are clear. The room vents can have hidden spores, so keep these areas clean too. 


Step #3. Be careful with your soil

If you see some spores growing on your soil, never pour any cleaning agents on it. The potent liquids could kill your plant.

It’s better to dispose of the mildewy soil and put the plant in new ground.


Step #4. Maintain proper ventilation in the room

After you clean everything, keep the room in good condition by having proper ventilation. Having high humidity after cleaning will just bring the fungus spores back. 

Ventilation can prevent excess humidity in your room, and powdery mildew spores won’t be able to settle. Now, your grow room is clean, and your plants can thrive without any annoying mildew. 


How To Avoid Powdery Mildew Infestation

Now that you’ve cleaned out the powdery mildew, you need to ensure it doesn’t grow back. This fungus could kill your plants if left unattended. 


1. Don’t allow unnecessary people and pets to enter your grow room

Spores can stick to clothes, skin, and fur. There’s a higher chance that spores can contaminate your room when several people and animals enter it. 


2. Monitor the humidity

Keep the humidity under 60%; anything higher makes your plants prone to powdery mildew. Install dehumidifiers, air conditioning, and oscillating fans to help with your humidity levels. 


3. Apply some foliage sprays

These sprays prevent mildew spores from growing if they’re already in the room. You can buy some in stores or make your own from hydrogen peroxide and isopropyl alcohol. 


4. Have regular maintenance in your grow room

Clean the grow room every three months to retain the sanitary conditions. You can use hydrogen peroxide or a bleach and water solution to clean every part of the room.

Remember not to mix bleach and hydrogen peroxide as this solution is too strong and can emit gasses. 



Now, your grow room is all clean! You can keep your plants safe when you know how to clean grow room after powdery mildew. 

Your harvest will be healthy and in good condition.

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