Harvest & curing
A weed curing jar is an airtight glass container designed to slow-cure harvested cannabis, breaking down chlorophyll and preserving terpenes for a smoother, more flavourful result. These German-made mason jars feature extra-thick glass, a galvanised wire bracket, and a rubber sealing ring that clicks shut with one hand — giving you a proper 100% airtight seal, not the sort-of-airtight seal you get from a repurposed jam jar nicked from the kitchen.
Fill your curing jar to roughly 75% capacity — that leaves enough headspace for air exchange when you burp the jar. Here's what each size holds and when it makes sense:
| Size | Capacity | Approximate Bud Capacity (75% full) | Best For |
|---|---|---|---|
| Small | 255ml | 7–8g | Sample batches, keeping strains separate |
| Medium | 400ml | 12–15g | Single-plant harvests, personal stash |
| Large | 800ml | 25–30g | Standard cure — the size most growers reach for |
| Xtra Large | 1140ml | 35–40g | Bigger harvests, bulk curing |
Our recommendation: the Large (800ml) is the sweet spot. It holds around an ounce at 75% fill — enough to cure a decent amount without cramming buds together, and small enough to open and inspect without exposing your whole harvest to ambient air. If you're running multiple strains, grab a few Smalls or Mediums and label them.
Drying your harvest gets it smokeable. Curing in a weed curing jar is what makes it actually good. During the cure, residual moisture migrates from the centre of the bud outward, chlorophyll continues to break down, and terpene profiles develop. When chlorophyll degrades, it removes that harsh, grassy taste you get from uncured flower — the difference between something that tastes green and raw versus something that's smooth and aromatic.
According to research published in Postharvest Operations of Cannabis and Their Effect on Cannabinoid and Terpene Content, postharvest handling — including curing — directly impacts the chemical profile and overall quality of the final product. A proper cure at around 62% relative humidity preserves cannabinoid potency and extends shelf life by months. Skip the cure or do it in a plastic bag, and you're throwing away weeks of growing effort in the last stretch.
Glass beats plastic every time for curing. Plastic is slightly porous, can leach chemicals, and holds static that pulls trichomes off your buds. Extra-thick glass like these German-made jars is completely inert — it won't absorb odours, won't react with terpenes, and won't degrade over time. You can cure in these jars for years and they'll perform exactly the same on day one thousand as day one.
| Specification | Detail |
|---|---|
| Material | Extra-thick glass |
| Origin | Made in Germany |
| Seal Type | Rubber ring + galvanised wire bracket |
| Seal Rating | 100% airtight |
| Closure Mechanism | Lever-action snap (one-handed operation) |
| Available Sizes | Small (255ml), Medium (400ml), Large (800ml), Xtra Large (1140ml) |
| Rubber Ring Colour | Red (XL currently ships with white ring) |
| Also Suitable For | Pickles, jam, dry herb storage, spices |
Complete your curing setup: pair these jars with a Boveda 62% Humidity Pack to maintain the optimal 62% RH inside the jar without any guesswork. A Digital Pocket Scale helps you weigh out consistent amounts per jar — filling to that 75% sweet spot is easier when you know exactly how much you're putting in.
We've sold mason jars for years, and the single biggest mistake we see is people cramming buds in until the lid barely closes. You need that 25% headspace — it's not wasted space, it's the air pocket that lets moisture equalise. Overfill the jar and you get uneven humidity, which is exactly how mould starts.
The second thing: these jars feel noticeably heavier than the cheap ones you find at supermarkets. Pick one up and you can feel the thickness of the glass wall — it's solid, not the kind of thin glass that chips the moment it touches a countertop. The galvanised wire bracket has a satisfying snap to it. You'll know it's sealed. With thinner jars, you're always second-guessing whether the lid is actually tight or just resting there.
One honest limitation: glass jars don't block light. UV degrades cannabinoids over time, so store your curing jars in a dark cupboard, drawer, or closet. Don't leave them on a windowsill or an open shelf that catches afternoon sun. The glass is thick enough to insulate temperature fluctuations a bit, but light protection is on you.
If you're weighing up glass curing jars against plastic containers or turkey bags, here's the short version: glass is inert, non-porous, and reusable indefinitely. Plastic is porous at a microscopic level, which means it slowly exchanges gases with the environment — your "airtight" plastic container is actually letting terpenes escape and outside air in. Over a 4–8 week cure, that adds up.
Plastic also builds static charge, and static pulls trichomes off buds. Open a plastic container after a few weeks and you'll see a fine dust of trichome heads stuck to the walls. That's potency you've lost. Glass doesn't have this problem. These German-made weed curing jars with their rubber-sealed lids give you a genuinely airtight environment that stays stable throughout the entire cure.
Curing breaks down chlorophyll and allows moisture to redistribute evenly through the bud. This removes the harsh, grassy taste of freshly dried flower and develops a smoother, more complex terpene profile. It also helps prevent mould by stabilising internal humidity at around 62%.
Minimum four weeks for a noticeable improvement. Most experienced growers cure for 8–12 weeks for the best results. Some strains benefit from even longer — up to 6 months. The flavour and smoothness keep improving well past the one-month mark.
Once or twice daily for the first 14 days, then every 2–3 days after that. Burping releases built-up moisture and CO2 while letting fresh oxygen in. Each burp should last 5–15 minutes. If you're using a Boveda pack, you can reduce burping frequency since it regulates humidity passively.
Absolutely. They're standard German mason jars — pickles, jam, spices, coffee beans, dried herbs, whatever you like. The airtight seal works just as well for kitchen storage as it does for curing. They're dishwasher-safe too.
Current production batches of the Xtra Large (1140ml) curing jar ship with a white sealing ring rather than the red one shown in photos. The material and seal quality are identical — it's purely a cosmetic difference. The jar is still 100% airtight.
About 75% — that leaves enough headspace for air exchange during burping. For the Large (800ml) jar, that's roughly 25–30g of dried bud. If you pack it tighter, moisture can't distribute evenly and you risk mould developing in the centre of the mass.
Yes, always. Jarring wet buds creates a sealed, humid environment where mould thrives. Dry until small stems snap cleanly — typically 7–14 days at 18–22°C. If buds feel spongy or stems still bend, give them more time on the drying rack before jarring.
Last updated: April 2026
