Weed Curing Jar
Harvest & curing
Weed Curing Jars — Made in Germany, Built to Lock Freshness In
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.
Which Weed Curing Jar Size Do You Need?
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.
Why Curing in Glass Jars Matters More Than You Think
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.
Weed Curing Jar Specifications
| 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.
How to Cure Cannabis in These Weed Curing Jars
- Dry your harvest first. Hang branches or place trimmed buds on a drying rack in a dark room at 18–22°C and 55–65% humidity for 7–14 days. Stems should snap, not bend, before you jar them. According to research in Post-Harvest Operations to Generate High-Quality Medicinal Cannabis, consistent drying conditions are critical for producing reliable, potent flower.
- Fill each weed curing jar to approximately 75% capacity — roughly 25–30g in the Large (800ml) jar. Don't pack the buds down. Drop them in loosely so air can circulate around each one.
- Snap the lever closed and store the jar in a cool, dark place. Aim for 18–22°C ambient temperature.
- For the first two weeks, open (burp) each jar once or twice daily for 5–15 minutes. This releases excess moisture and replenishes oxygen. When you open the lid, give the buds a gentle shake to prevent them sticking together. If you smell ammonia, your buds went in too wet — leave the lid off for an hour and monitor closely.
- After two weeks, reduce burping to once every 2–3 days. The humidity inside the jar should stabilise at around 62% — a small hygrometer dropped inside the jar makes this easy to track.
- Continue curing for a minimum of 4 weeks. Many growers cure for 8–12 weeks for the best terpene development. The longer you cure (within reason), the smoother the result.
- Once the cure is complete, keep the jars sealed in dark storage. Properly cured and stored cannabis can maintain its quality for 12 months or more.
Glass vs. Plastic for Curing Cannabis
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.
Frequently Asked Questions
What does curing actually do to cannabis?
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%.
How long should I cure cannabis in a jar?
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.
How often do I need to burp my weed curing jars?
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.
Can I use these jars for storing dried herbs and other things?
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.
Why does the XL jar come with a white rubber ring instead of red?
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.
How full should I fill my weed curing jar?
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.
Do I need to dry my buds before putting them in curing jars?
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
