You’ve probably encountered mold at some point in your life. Old strawberries in your refrigerator, the bread heels in your pantry, your college bathroom that you routinely cleaned only after letters from the health department. There’s no doubt about it – mold is all around us.
Under good circumstances, mold is little more than an inconvenience or a waste of food. But it’s not always benign. From acute allergies to chronic health conditions, mold is mean. And, when it meets marijuana, it’s just downright rotten.
In scientific terms and nerdy definitions, mold is a type of fungus, eukaryotic microorganisms that fester on dead organic material including wood, plants, and leaves. It’s not always visible to the naked eye, but when it is, it’s seen in a variety of different shades. The color is dictated by its nutrient sources, the surface it rests upon, and its age.
The Causes of Mold
The number one thing conducive to mold is moisture: this is why you’re more likely to find it in your shower than in your wine cellar. A lack of air circulation also helps it thrive, as spores multiply under tight conditions. In grow rooms, fans mitigate this type of welcoming environment, leaving mold less likely to move in and get comfortable. But that doesn’t make your plants immune entirely.
Temperature is important too, as mold can’t flourish in cold conditions (under 40 degrees) or those that are extremely hot (over 100 degrees)
Pot shops in dry climates are typically less effected than those located in areas wet and humid: you might be Sleepless in Seattle because you’ve been up all night drying off your herb.
Like us, mold needs food and oxygen in order to survive. It decomposes things such as gypsum board and oak and feeds on those nutrients. While it can’t grow on inorganic material – concrete, for example – it feeds on the dirt and dust concrete harbors. And, of course, it feeds on your marijuana plants. Belly up to the bar, weed is among its favorite meals.
Why Mold is Bad
Mold isn’t exactly a houseguest you invite over with promises of home cooked meals and superfast Wi-Fi: while some is harmless, other types are dangerous. If left alone in a residence, it’s possible for the more troublesome types to cause a respiratory response in those who live there. Symptoms include sneezing, coughing, and sore throat that persists even after a tumbler of Nyquil.
Mold is also dangerous for pot smokers who smoke infected plants.
Sometimes, people mistake rotten weed for weed that’s laced with other drugs, such as opium
They may experience headaches, vomiting, trouble breathing, diarrhea, and heart palpitations. A pneumonia is also a possibility.
What Mold Looks Like
You can’t always see mold without the help of a black light or a lens. But, when it’s visible, it often appears as dark spots or spores; white, grey, yellow, or brown fuzz; or a white, grey, or black web-like material.
Mold gives off an odor, this makes knowing what your herb is supposed to smell like vital
If the smell changes to one that’s musty, urine-like, or the odor of a sweat sock after a marathon, you might have a problem. A smell described as “intensely lavender” may also be an indication of infestation.
How to Keep Mold Away from Your Plants
The best way to keep mold away from your plants is to understand why it happens in the first place. Is the moisture too high during the drying process? Do you use fruit peels to add flavor to your buds, inadvertently introducing the fungus? Do you store wet plants in airtight containers? Are you trying out a new business model, hoping to gain a reputation as a fungi?
In most circumstances, there are five types of mold that are heavy marijuana proponents: aspergillus (these spores are extremely common – you’re probably inhaling some right now); penicillium (some types of this mold are used to create antibiotics); rhizopus (a mold found on fruit, breads, peanuts, and tobacco); mucor (a fast-growing type but not powerful against warm-blooded creatures); boytrytis (also known as “bud rot,” it fancies itself a wine connoisseur, infamous for its attacks on vineyards, but it goes after cannabis too).
Still, as many of us know, genetics aren’t the end all be all: just because your grandpa lived to be a hundred doesn’t mean you should replace Tae Bo with tacos. Care, environment, and sheer luck – for humans and plants – are other pieces of the puzzle.
A few recommendations on how to avoid mold include buying strains suitable for your region (for outdoor growth, climate is most important); learning the details of the strain (both minor and major); refraining from planting strains that are risky (mold is very contagious); experimenting with new strains in small quantities; and saving cuttings to use as backups for future mother plants (just in case).
You should also grow in an area where your plants will feel a breeze through their leaves, but not so much that they become overwhelmed by wind. Rain is another concern: protect your pot from pours with an overhead tarp (not one placed directly on top of the flowers). If you live an area where dew is common each morning, give your plants a good shake.
When Mold Happens
Cannabis infected mold should be disposed of immediately, not only for human health but also to stop it from spreading to nearby plants. Some people have a harder time than others parting with their buds, mold be damned. But, particularly for those growing commercially, it’s not worth the risk. Plus, smoking moldy weed is sort of akin to Seinfeld’s George Costanza pulling that éclair out of the trash when he thinks no one is looking. Take a lesson from him in regards to fung-filled hemp: someone’s always bound to notice.