How to Store Weed — Keep It Fresh for Months, Not Weeks
How to Store Weed
Four things degrade cannabis, and three of them are in your kitchen. Get storage right and flower keeps for six months or more.
The short version
Airtight glass jar, somewhere cool and completely dark, at 59–63% humidity. Not the fridge, not the freezer, not a plastic bag, and not the windowsill. Get those right and flower stays good for six months or longer.
The four enemies
Light is the worst. UV degrades THC faster than anything else on this list. A clear jar on a shelf is the single most common storage mistake — darkness matters more than the container.
Air oxidises cannabinoids. THC degrades into CBN, which is why old weed feels sleepier and weaker rather than simply weaker. Every time you open the jar you swap the air, so a jar sized to its contents beats a big jar half empty.
Heat accelerates everything and dries out the terpenes that carry the smell and flavour. Above roughly 25°C degradation speeds up noticeably.
Humidity cuts both ways. Too dry and it turns to dust that burns harsh. Too damp and you risk mould, which is the one failure that makes cannabis genuinely unsafe rather than just disappointing.
What to store it in
Glass jars with a proper seal are the answer. Mason jars, or the jars flower often arrives in. Glass is inert, it seals reliably, and it does not hold smell.
Avoid plastic bags. They are not airtight, they crush the flower, and plastic builds a static charge that pulls trichomes off the buds and onto the bag. That fine dust on the inside of a baggie is the part you actually wanted.
Avoid plastic tubs for anything long-term, for the same static reason.
Vacuum sealing works well for anything you are not opening regularly — it is exactly why we ship vacuum-sealed.
Humidity control
Two-way humidity packs — the small sachets sold as 62% or 58% — both absorb and release moisture to hold a set level. For anything you are keeping more than a few weeks they are the cheapest meaningful upgrade available.
59–63% is the target. Below about 55% flower gets brittle and harsh; above about 65% the mould risk climbs sharply.
Do not use a piece of fruit peel or a damp cotton pad. Both are old advice, both introduce uncontrolled moisture, and both can grow mould.
Why not the fridge or freezer
People assume cold is good. For cannabis it mostly is not.
The fridge cycles humidity every time the door opens, and condensation forms on the jar. Fluctuating moisture is what grows mould.
The freezer makes trichomes brittle enough that they snap off with the slightest handling. You lose potency to the bottom of the container.
A cupboard in a cool room beats both comfortably.
Storing other formats
Concentrates — shatter, budder, live resin — prefer cooler and darker than flower. A fridge is acceptable here, in an airtight silicone or glass container. Let them come to room temperature before opening to avoid condensation. See how to smoke shatter.
Edibles follow their own food rules — gummies keep well at room temperature away from heat, chocolate needs to stay cool. More importantly, keep them locked away from children and pets. See how to dose edibles.
Vape cartridges should stand upright, somewhere cool, out of light. Lying flat can cause leaking.
How to tell it has gone off
Smell is the first sign. Cannabis that has lost its aroma has lost its terpenes, and the flavour goes with them. It is not unsafe, just dull.
Texture — crumbling to dust means too dry; damp or spongy means too humid.
Mould is the one that matters. Look for white or grey fuzz, or fine webbing, particularly deep inside dense buds. It can look like trichomes at a glance — trichomes sparkle and look crystalline, mould looks fuzzy and dull. If you suspect mould, throw it out. Do not smoke it, and do not try to salvage part of the bag.
What we ship it in
Every order leaves vacuum-sealed and odour-proof in a plain, unmarked mailer. That protects it in transit — but once you open it, storage is on you. Moving it into a glass jar with a humidity pack takes a minute and is the difference between flower lasting a fortnight and lasting six months.
Buying by the ounce only makes sense if you store it properly. From $190.
From $190
Shop King Louis XIII
Questions people actually ask
How long does weed stay fresh?
Six to twelve months stored properly — airtight glass, dark, cool, 59–63% humidity. Badly stored, it can lose noticeable potency and most of its smell within a month.
Should I keep weed in the fridge?
No. The fridge cycles humidity every time the door opens and causes condensation, which is what grows mould. A cool dark cupboard is better. The freezer is worse again — it makes trichomes brittle enough to snap off.
What humidity should weed be stored at?
59–63%. Below 55% it gets brittle and harsh; above 65% the mould risk rises sharply. Two-way humidity packs hold the level for you.
Are plastic bags bad for storing weed?
Yes. They are not airtight, they crush the flower, and static pulls trichomes off the buds onto the plastic. That dust on the inside of a baggie is the potent part.
How can I tell if weed has mould?
Look for white or grey fuzz or fine webbing, especially inside dense buds. Trichomes sparkle and look crystalline; mould looks dull and fuzzy. If you suspect it, throw the whole lot out — do not smoke it and do not try to salvage part.
Does weed lose potency over time?
Yes. THC oxidises into CBN, which is why old cannabis feels sleepier rather than simply weaker. Light accelerates this more than anything else, which is why darkness matters more than the container.
Worth storing properly
Flower from $25, shipped vacuum-sealed. Free shipping over $120, Canada-wide.
