Black Moldy Weed

black marijuana and mold

Modified on: 21/03/2024


If you like CBD weed, you should always treat it the right way, even concerning its preservation. It is a very delicate product. Cannabis flowers are not like conventional dried flowers! They can be easily affected by mould and pests, and in the worst case, you could open the drawer and find blackened marijuana instead of the green buds you bought.

We have no idea that you don’t want to have a musty CBD flower. As a result, we will first explain how to spot mushrooms on your precious cannabis buds; then we will give you several tips on proper storage of products.

How to Recognize Mould and Bud Rot in Cannabis

marijuana bud good conservation

If you are not an expert in legal cannabis, or at least you have never seen flowers in a bad state, then you may need precise directions to understand whether the flowers have been affected by mould spores or not.

First of all, you’ll need to have a magnifying glass (or, if possible, a black light). Put your legal cannabis flowers under the lens and pay attention to the following:

  • Dark spots.

  • Spots that could be of different colours – for example white, dark brown or yellow.

  • White, grey or black elements, similar to a spider’s web.

  • A smell of mould.

  • An ammonia smell (similar to urine).

Of course, if you noticed blackened marijuana, but also brown, while it was green, then you can get rid of your flowers right away.

Some fungi, including black mould, are hazardous. For example, spores can cause respiratory problems such as asthma and even pneumonia due to cannabis mould.

If you keep your bag of cannabis inside your room, you should check several times a week that this harmful fungus has not attacked it.

Are you wondering what causes black mould on cannabis?

The leading cause of the formation of this fungus is moisture. It also contributes to the poor circulation of fresh air in the room in which cannabis is stored (or grown).

There are also practices to follow for the proper conservation of CBD flowers. Read on to get to know them all!

Read also: Cannabis CBD in Italy

1) Marijuana Conservation Tips: Avoid Plastic Bags

Avoid storing your legal weed in plastic bags, as they can keep moisture inside them after opening.

Waterproof glass pots are the best choice for storing your cannabis flowers. They are found everywhere, as they are commonly used to store foods such as dry pasta and jams. The airtight pots are ideal because nothing enters or leaves the container, until the opening, without letting the oxygen in.

What you put inside a glass jar stays as good as the first day, until you expose it to oxygen. Also, the glass has no smell, so you will not contaminate cannabis with different scents and flavours of its own.

Even if you keep your marijuana flowers in a very moist room, mould (black, white or other colours) will be very difficult to create, especially if you follow the advice of the following paragraphs.

The only drawback of transparent glass is that it allows light to penetrate inside. And the sun’s rays could damage your cannabis. So find a closet, a drawer, or at least a location in your home that stays dark all day.

Do not expose the pot to sunlight as this could cause condensation and then form mould.

2) Marijuana Conservation Tips: Ideal Temperature and Humidity

The ideal would be to store your cannabis in a cool, dark place (and, we remind you, in a glass jar).

What’s fresh? Try to keep the temperature below 20-25ºC. Moisture, as you may have already read, is also a mould-forming factor, but it is a little more challenging to control.

ideal humidity for cannabis buds

Ideally, you should do this is to keep the marijuana containers in a place that has about 60% moisture (that is to say, a relative humidity is ideal). Over 65%, and you will have a mould problem that can be annoying.

Be careful though: never store marijuana in the refrigerator or freezer. Fluctuations in temperature and humidity could cause irreparable damage to marijuana buds. Besides, freezing the bud makes it fragile, and cannabinoid-rich trichomes could be damaged. Cannabis that does not smell is a significant sign of this problem.

Another signal is a flower that is too dry. Cannabis must be sticky, and this shows that it is undoubtedly in good condition.

Read also: How to store hashish? Here are the most effective ways

3) Marijuana Conservation Tips: Don’t Pile too Many Flowers Into The Same Container

When choosing the perfect pot, think about how much CBD cannabis you want to store indoors. Do not use a jar that is too large for a small number of cannabis flowers, as it allows more oxygen to enter after opening the lid.

Try to adapt the container to the volume of cannabis to be stored. As the number of cannabis decreases, move it into smaller and smaller jars.

Bonus Tip: Keep each strain of marijuana separately. Each variety has its unique characteristics, and the best way to maintain them is to store it in its jar, separated from the other strains!

What Happens If You Smoke Moldy Weed

What happens if you smoke moldy weed is a critical question that every cannabis user should understand to avoid potential health risks.

Moldy weed, often a result of poor storage or environmental conditions during cultivation, can harbor various types of mold and fungi, such as bud rot, powdery mildew, or grey mold.

Smoking moldy weed can introduce harmful mold spores into the lungs, potentially leading to a serious lung infection and other health consequences.

Even inhaling small amounts of mold spores from smoking mouldy weed can cause respiratory issues, sinus pain, chest pain, and weaken the immune system, especially in individuals with weakened immune systems.

Indoor and outdoor cannabis growers alike should take precautions to prevent mold growth, including maintaining proper humidity levels, good air circulation, and promptly removing any signs of mold or mildew from their plants.

Storing dried buds in airtight containers, such as mason jars, with humidity packs can help prevent mold during the curing process. Ultimately, smoking moldy weed poses significant health risks and should be avoided to ensure a safe and enjoyable cannabis experience.


In conclusion, the presence of black moldy weed poses significant health risks to cannabis users, highlighting the importance of proper storage and cultivation practices. Smoking moldy weed can introduce harmful mold spores into the lungs, potentially leading to serious respiratory infections and other health complications. To preserve the quality and safety of CBD Cannabis and flowers and avoid the dangers of smoking moldy weed and cannabis mold itself, cannabis growers should adhere to three essential tips.

Firstly, maintaining optimal environmental conditions is crucial. Indoor growers should ensure good air circulation and ventilation in their grow rooms to prevent stagnant air, which can create a breeding ground for mold and mildew. Outdoor growers, on the other hand, should be vigilant about humidity levels and protect cannabis plants from excessive moisture, especially during rainy seasons.

Secondly, proper storage is key to preventing mold growth in cannabis buds. Storing dried buds in airtight containers, such as mason jars, with humidity packs can help maintain ideal moisture levels and prevent mold during the curing process. Regularly inspecting buds for any signs of mold or mildew and promptly removing any infected cannabis plant material can also mitigate the risk of mold contamination.

Lastly, education and awareness are essential for both growers and consumers. Understanding the different types of mold and their symptoms can help identify and address mold issues early on. Growers should invest in tools like magnifying glasses to inspect their plants for any signs of mold growth, while consumers should be vigilant and avoid purchasing or smoking moldy weed.

By following these three tips—maintaining optimal environmental conditions, proper storage practices, and increasing awareness of mold-related risks—cannabis growers and users can effectively prevent the growth and spread of mold, ensuring a safer and healthier cannabis experience for all.

Now that you know how to avoid the problem of blackened marijuana, you can buy it without fear. Discover all the legal CBD cannabis varieties on Justbob!