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How to Tell if Your Stash of Weed Has Gone Bad

Avoid the conundrum by just storing it well in the first place.

Let’s say you chance upon a stash of weed you forgot about some time back. Happy day! But … is it even good? You don’t even remember stowing it away, let alone when you bought it. Can you still smoke it?

Can Weed Go Bad?

The good news is, weed doesn’t really “go bad;” its chemical makeup just changes. Marijuana is a plant, just like the veggies and herbs in your kitchen. Cells break down, molecules oxidize. Just as the dried oregano in your spice rack becomes less flavorful over time, weed becomes less potent. Old weed won’t kill you, but it also won’t get you all that high.

How to Store Weed

The best way to avoid this question in the first place is to store your weed properly. Glass or ceramic containers are your best bet. You want to make sure the container is airtight, and won’t transfer smells or flavors onto your precious weed. Store your pot in a dark, cool refuge that’s not your refrigerator or freezer — too cold environments can suck the sweet, sweet moisture out of those leaves.

Fresh weed is full of the cannabinoids CBD, CBC, and THC, but sit your weed down for a bit in ultraviolet light (i.e., sunlight), and your THC will break down into CBN, a cannabinoid that is way less potent and much more disappointing. Basically: Keep your weed in a still, dark, cool environment, and you’re guaranteed the best flavor.

But let’s say you didn’t get around to storing your weed like you should have, and now you’re stuck with a Ziploc bag of mystery marijuana that may or may not be good.

Appearance

If your recently discovered stash doesn’t look much like weed anymore, just some dried out powdery leaves, it’s probably not going to be all that enjoyable to smoke. If you spot a fuzzy white powder growing on it, your weed is moldy and you definitely shouldn’t smoke it, unless you want to risk heart and lung problems. Mold spores, like moist places without a lot of airflow, which can happen if you store your weed where it’s too moist.

Sound

When you pull apart your re-discovered weed in your hands, you should hear snaps, not crackles, which can mean your weed is too dry. If your weed is silent, it has a lot of moisture, and you should be on the lookout for mold.

Smell

If your old stash smells musty, or like urine or a locker room, mold is probably the culprit. Chemical or plastic scents are a result of poor storage or pesticide contamination. Old weed might not smell as strong as the day you stuck it somewhere and forgot about it, but it shouldn’t have any off smells. Weed should smell like weed.

Taste

If it looks like your old stash is free of mold, and you decide to light some up, you’ll know pretty quickly if it’s really gone bad just by the taste. It should still taste like weed, without off flavors.

Smoking poor quality weed won’t hurt you (with the exception of mold) — it just won’t be quite as enjoyable as the fresh stuff. You probably won’t get as high thanks to a lower THC content, but that’s about it. Enjoy your re-discovered stash!

Avoid the conundrum by just storing it well in the first place.

White Powdery Mildew

by Sirius Fourside

Have you seen white spots on your leaves? Are your leaves dusted with round patches of powder that looks like flour?

If so, you’re most likely dealing with White Powdery Mildew, also known as White Powdery Mold or just “WPM” to cannabis growers.

White Powdery Mildew is usually a minor annoyance that can be easily fixed, but if you don’t catch it early, WPM can turn into a catastrophe that ruins an entire marijuana harvest!

For those who haven’t experienced WPM, imagine circular patches of a living, breathing, fuzzy, flour-looking substance showing up on your plant’s leaves without any warning. From there, the mildew can easily spread to other leaves and buds, rendering the buds unusable.

You’ll see “powder” on your leaves…

White Powdery Mildew has such an easy time spreading that even careful growers who take proper precautions can still experience it.

Luckily, the issue in the picture above was easily resolved because it was caught early and because White Powdery Mildew is completely reversible up to a point.

This article will arm you with the information to stop WPM’s proliferation before it even has a chance to take hold!


What IS White Powdery Mildew?

White Powdery Mildew is a rapidly reproducing (both sexually AND asexually) fungus who only knows how to do two things:

Eat your plants

Make more White Powdery Mildew

Fortunately, White Powdery Mildew is easy to spot since it creates white patches of fungal growth that stand out against the green leaves of a cannabis plant.

It can be removed from plants with proper treatment if spotted early on, but any buds with WPM should be discarded as they most likely contain many more spores than your eyes can see.

What causes White Powdery Mildew?

High Humidity

WPM needs moisture to thrive, but that doesn’t necessarily mean it needs water. Having a grow area with high humidity is all WPM needs to get started. This seems to be a bit problematic since young cannabis plants grow best in relatively humid environments (40% -60% RH). Luckily, high humidity usually only becomes an issue when it’s combined with the next cause (low/no airflow).

People who live in environments with extremely high humidity (such as the southern US or anywhere in the UK) can purchase a dehumidifier to control humidity in the grow area. This is especially important during the flowering phase when humidity needs to be much lower (45% rh) to prevent rampant growth of WPM and bud mold.

Low/No Airflow

White Powdery Mildew has a hard time settling in a grow room where the air is being moved. High humidity will give WPM the conditions it needs to survive, but poor airflow is what gives it the ability to settle down in the first place. In fact, a small (preferably oscillating) fan moving air in a grow area will prevent the vast majority of White Powdery Mildew woes.

Poor Ventilation

If you have WPM spores in your grow area and the air in grow area is never exchanged for fresh air, the spores get multiple chances to land on your plants and reproduce. This happens most often in conditions where cannabis is being grown in a closed, unventilated space – such as a closet – and precautions aren’t taken to exchange old stale air for new fresh air.

Leaf-on-Leaf Contact

Leaves that are touching each other will form moisture between them, and thus they become more likely to contract WPM. Untrained bushy/leafy plants with lots of new vegetative growth are especially prone since they will often have their leaves mashed up against each other as they try to reach toward the light.

Advanced growers can defoliate some of the fan leaves that are completely shaded from the grow light to make fewer choice landing spots for White Powdery Mildew. Also, defoliation frees up energy for the plant to use when done correctly and increases yields! See our article on defoliation for more info.

How to Eliminate White Powdery Mildew

As I mentioned earlier, I recently had a battle with White Powdery Mildew. Rather, it might have been a battle if I noticed it later or waited to fix the problem. That’s the one good thing about WPM: in most cases when WPM is caught early, you can remove all traces of the mildew without harming your plants.

There are quite a few products and homemade concoctions people use to treat WPM. Among the effective treatments are:

Milk (1:9 ratio of milk to water)

Baking soda (2 tablespoons per gallon of water)

Neem Oil (4 teaspoons per gallon of water)

Hydrogen Peroxide (1 teaspoon of 35% H202 per gallon of water)

SM-90 (1:5 ratio of SM-90 to water)

Rather than go into these methods, I’m going to give you the simple strategy I use that gets rid of White Powdery Mildew on the first try, every time! Here’s my trusted 3-Step White Powdery Mold cure:

Remove White Powdery Mildew from leaves – Get some water (tap water works fine) and some paper towels. Wet the paper towels and use them to gently wipe the mildew off the affected leaves whilst being careful not to jostle any leaves with spores on them. Using a wet cloth will ensure that more spores stick to the cloth instead of becoming airborne. Note: While it isn’t necessary to use paper towels, their disposability helps to curb the spread of spores from one leaf to another.

Ensure plants have proper airflow and ventilation – Even if you have absolutely no airflow or ventilation in your grow room, having just two fans will drastically reduce your chances of encountering WPM while also benefitting your plant’s overall health. One fan should be oscillating if possible and should gently blow air over your plants. All the plants need is enough air to gently rustle their leaves which will make it hard for WPM to settle down. The second fan should be in your grow room pointing outward to exchange old air with fresh air. Having a fan pointing out of your grow room will force old air out of the room, and in turn, pull new air into the room. At this point, you’ll have new air coming in, being used and circulated, then kicked out. Keep in mind that two fans is a minimum .

Treat the infected plant with one of the options below to kill spores prevent future growth – Mix up your treatment of choice in a clean sprayer/mister. We recommend Lost Coast Plant Therapy (1oz/2btsp per gallon of water) or GrowSafe (2oz/4tbsp per gallon of water) as a safe second option . Make sure to consult the instructions on your treatment of choice to find the recommended dosage. Wait until just before your lights for off for the day and mist your (newly cleaned) plants. Get all the leaves even if you don’t see WPM on them!

There you have it! If you end up running into White Powdery Mildew, give this advice a shot and you won’t have to deal with it past that first day. If you do end up using these steps, feel free to let us know if it helped you or not, or how you did it differently. When growers know just a little bit about this plant disease, it doesn’t have a chance!

White Powdery Mildew Defense

What’s the easiest way to fight against White Powdery Mildew?

Have it completely outgunned!

Get the right stuff to let White Powdery Mildew know that your grow room is off limits!

Lost Coast Plant Therapy – Kills WPM as well as a bunch of other pests and it’s safe for flowers, pets and people!

GrowSafe – Another safe-for-buds pesticide that kills WPM and other pests. OMRI listed as organic!

Note: SM-90 is no longer available! Find out more here: What happened to SM-90?


Handheld Mister/Sprayer
– A mister is awesome for applying treatment. Also, it’s the best way to foliar feed your plants!


Bonus! Papaya cannabis strain
– The strain Papaya is potent, flowers early, and – most importantly – is disease resistant!

White Powdery Mildew (aka White Powdery Mold) can be the cause of white spots on your leaves that looks like patches of flour. Learn how to get rid of it! ]]>