How to store cannabis so it keeps its strength
6 min read
Cannabis flower is a living, perishable thing. From the moment it is cured, its aroma, flavour and potency begin a slow decline — and how it is stored decides whether that takes years or weeks. The good news is that the variables are few and the fixes are cheap.
This guide covers the four things that matter most — container, humidity, temperature and light — and what a dispensary's own storage habits quietly tell you about what you are buying.
Container: glass jar, not plastic bag
An airtight glass jar is the simplest upgrade you can make. A sealed jar limits the oxygen that oxidises cannabinoids and terpenes, and glass — unlike thin plastic — does not carry a static charge that strips the delicate resin (the trichomes) off the flower. Plastic bags are fine for a day or two of transport; they are a poor home for anything you want to keep.
Fill the jar so there is a little headroom but not a lot of empty air, and open it only when you need to. Every opening swaps the conditioned air inside for whatever is in the room.
Humidity: aim for a stable mid-range
Humidity is the variable most people get wrong. Too dry and the flower turns harsh and dusty, and fragile terpenes evaporate; too damp and you risk mould. A common target range for stored flower is roughly 55–62% relative humidity, and two-way humidity packs (Boveda and similar brands sell 58% and 62% versions) hold a jar near a set point by either releasing or absorbing moisture as needed.
Which number you choose is a matter of taste: 62% keeps flower a touch springier, 58% gives a drier, sometimes smoother draw. Either way, the point is stability — a steady mid-range beats a jar that swings wet and dry.
A note on the freezer and fridge
The fridge is a trap: it runs humid, its temperature swings each time the door opens, and condensation invites mould. Long-term freezing can preserve potency but makes trichomes brittle, so they snap off if the flower is handled while frozen. For most people, a cool, dark cupboard beats both.
Temperature and light
Heat speeds up every form of degradation and, above roughly 25°C, encourages mould. Cool and consistent is the goal — a drawer or cupboard away from appliances and sunny windows. Light, especially direct UV, is the single fastest way to break down cannabinoids, which is why quality flower is kept in opaque or tinted containers and out of the sun.
Why a shop's storage habits signal freshness
You can read a dispensary the way you read a fishmonger. Flower kept in sealed, opaque containers, away from hot display lights, with a visible packaging or harvest date, is flower someone is treating as perishable — because it is. Big clear jars baking under bright lights, or product with no date at all, tell their own story.
This is also why the same strain can disappoint: a careless supply chain undoes good genetics. Storage is not a detail at the end — it is part of the quality you are paying for.
A simple checklist
- Airtight glass jar, kept mostly full and opened sparingly.
- A 58% or 62% two-way humidity pack inside the jar.
- Cool and stable — a dark cupboard, not the fridge.
- Out of direct light; opaque or tinted container.
- Check the packaging or harvest date before you buy.
Frequently asked questions
How long does cannabis flower stay good?
Stored well — airtight, cool, dark and at a stable mid-range humidity — well-cured flower can hold most of its aroma and potency for six months to a year, and often longer. Stored badly, in a bag on a warm sunny shelf, it can noticeably fade within a few weeks.
Should I keep cannabis in the fridge or freezer?
Generally no. The fridge runs humid and swings in temperature, which invites mould, and freezing makes the resinous trichomes brittle so they break off when handled. A cool, dark cupboard is more reliable for everyday storage.
What humidity is best for storing cannabis?
A stable mid-range, commonly cited as roughly 55–62% relative humidity. Two-way humidity packs sold at 58% or 62% hold a jar near that set point. The exact number is a matter of preference; consistency matters more than the precise figure.
Why does the same strain feel weaker than last time?
Often it is storage and handling rather than the genetics. Light, heat, air and time degrade cannabinoids and terpenes, so flower that sat in a clear jar under display lights will feel flatter than the same strain kept sealed and cool.
Keep exploring
Put this into practice: build your Taste Match to find flower by how it actually smells and feels, or browse the Harvest catalog. More guides on the Learn hub.
Information only — not medical or legal advice. For adults 21+ where cannabis is legal.