Choosing Cannabis Products
How to Keep Dried Cannabis Fresh
You don’t have to be a cannabis connoisseur to know that when it comes to dried flower, fresh is best. Across the industry, Licensed Producers are using innovative techniques and clever strategies to ensure their bud is at its best when it lands in your hands.
Last updated April 24, 2026 | Published on January 18, 2022
There’s nothing worse than opening a package of cannabis flower that you’ve just bought — dreaming of those sweet, aromatic terpenes and anticipating the first delicious puff all the way home — only to be greeted by a dry, dusty heap.
Beyond its dried out appearance and aroma, there are other important reasons to keep cannabis fresh, including:
- preserving THC and CBD potency
- preventing mould and mildew
- maintaining a sticky, resinous texture
- extending shelf life
Ensuring flower is still fresh when it gets into consumers’ hands after growing and processing at scale, moving through legally mandated testing and analysis, and shipping to multiple markets, is no easy feat. From how it’s harvested in the field to how it’s cured and packaged, here are some of the innovative ways Licensed Producers and consumers can make sure cannabis flower stays fresh.
From the grow room to the curing room
Many cannabis Licensed Producers (LPs) focus on the flower at every step of the process, paying close attention to how it looks, smells and holds up during growing, drying and trimming.
One way LPs protect quality is through staggered harvesting. Instead of doing a few big harvests each year and storing the product for a long time, some growers harvest smaller batches more often. This means less time in storage and fresher cannabis for consumers.
The drying and curing process
Drying and curing play a big role in preserving terpenes and keeping moisture levels just right. Many LPs use a slow, cool drying process and then move the flower into carefully controlled curing rooms. The goal is simple: Reach the right moisture level before packaging.
A common target is flower that settles between 55 and 65% relative humidity in its final container. (Exactly how to achieve that is still widely debated.)
Paying close attention to temperature, airflow, humidity and timing can make a big difference in flavour, aroma and the overall experience.
The right packaging to keep cannabis fresh
The containers cannabis is sold in are one of the most important elements of delivering fresh, flavourful flower. The packaging — be it glass bottles, Mylar pouches or pre-rolls that are sealed nice and tight — has to keep out light and oxygen (both of which cause degradation) and keep optimal moisture levels in. With too much moisture, you risk mould; with too little, you end up with dried-out bud.
In the case of whole dried flower (as opposed to pre-rolls) that you roll into a joint or pack into a vaporizer or pipe, the packaging should protect the bud so it doesn’t get banged up in transit or while sitting in stock rooms. Damage can degrade the potency or, at the very least, degrade your experience of the full aroma profile of your cannabis. Just like with coffee, there’s nothing like freshly ground.
Oxygen can speed up degradation, so some Producers use nitrogen flushing in sealed packages. Replacing oxygen with nitrogen helps slow quality loss. It can also slightly pressurize flexible packages, adding a layer of protection during shipping.
Other LPs use airtight tins with controlled nitrogen added inside. These containers are designed to limit oxygen exposure and reduce microbial risk.
Packaging materials also matter. LPs can include humidity packs inside an airtight container to maintain the correct moisture level of dried cannabis. Some formats are selected to reduce the risk of chemical interaction between plastics and cannabinoids. As sustainability becomes a greater focus for Producers and consumers, reusable and recyclable packaging are becoming more common.
There are many options for helping keep cannabis packaging out of landfills. Here’s what you need to know about recycling cannabis packaging.
Truro Cannabis also makes use of a nitrogen push to prevent yeast and bacteria from getting at their flower, but their solution was to partner with Nitrotin, a Canadian packaging company. The Nitrotin system uses premium food-grade cans, a blast of liquid nitrogen, and a hermetic seal, instead of the more common practice of including a moisture pack to maintain humidity. (Moisture packs don’t combat any residual oxygen that may be remaining in the package.)
Trust and transparency
There’s a trend toward growing transparency about exactly where your cannabis is coming from, when it was packed and when it was actually harvested — another way LPs are holding themselves accountable to a freshness standard.
Some Producers provide batch tracking systems that allow consumers to enter a lot number and view details such as harvest date, moisture content, cannabinoid levels and terpene profiles. The certificates of analysis, required dor all legal products, also shows the product is free from harmful chemicals and microbes.
Printing harvest dates directly on packaging is another way to improve transparency. For many cultivators, shortening the time between harvest and retail is a key priority to help ensure a fresher product reaches consumers.
How to keep cannabis fresh at home
Producers can take every step to keep flower fresh, but once the package is opened, proper storage is up to the consumer.
Too much moisture can cause mildew, and light exposure may reduce potency, so dried cannabis should be kept in a cool location, away from light, in a dry, airtight container. Use a moisture pack or humidifying stone to keep moisture levels optimal.
Does freezing cannabis keep it fresh?
Freezing cannabis can slow THC degradation and better preserve terpene profiles compared with room-temperature or refrigerated storage. Proper technique is important, including storing the flower in airtight glass containers and allowing it to thaw slowly under controlled conditions.
If you suspect your dried flower has become mouldy, avoid consumption. If you discover a product you just purchased contains mould, contact OCS customer service.
For more information on how to keep your flower fresh at home, read our guide on how to properly store cannabis.
Safe cannabis storage and disposal
Remember to keep cannabis products stored safely far beyond the reach of kids and pets, as well. It’s a good idea to use lockable storage containers.
To help protect others — especially children and youth — Health Canada recommends making cannabis unfit for consumption before disposal.
