How Many Jars for Curing Weed? Jar Count Guide
Use one quart Mason jar per ounce of dried weed, filled about 75 percent full. See jar counts by harvest size, plus prep and burping steps.
Where to Buy Curing Jars for Cannabis
Buy food-grade glass jars with airtight lids. The jar must hold cured flower at 58% to 62% relative humidity. A Mason jar with a two-piece metal lid works. A jar with a cork, wood, or friction lid does not.
Start with the lid. The lid controls the cure. A metal lid with a plastisol liner or a rubber gasket seals against glass. Test the seal before you fill the jar. Put 1 inch of water in the jar, close the lid, invert the jar, and wait 1 minute. Water on the rim means a bad seal.
Where to Buy
- Grocery stores and hardware stores: Ball, Kerr, and Anchor Hocking jars. 16 oz wide-mouth jars cost $2 to $6 each. Stock changes by season.
- Kitchen supply stores: cases of 12 jars. Ask for wide-mouth lids and bands.
- Homebrew shops: amber glass jars and 1 gallon glass vessels. Staff know gasket sizes.
- Cannabis packaging suppliers: amber jars, humidity packs, and labels. Case quantities of 24 to 48 jars. Minimum orders apply.
- Online retailers: confirm lid type, liner material, and return policy. Marketplace listings often omit liner specs.
Skip sellers that list curing jar with no lid material. Skip jars with printed volume marks inside the neck. Flower catches on the marks.
Parameters
Size
Fill the jar to 75% of capacity. Leave 25% headspace for air. Use these sizes:
- 4 oz jar: 3 g to 7 g.
- 8 oz jar: 7 g to 14 g.
- 16 oz jar: 14 g to 28 g.
- 32 oz jar: 28 g to 56 g.
A 16 oz wide-mouth Mason jar holds 21 g to 28 g with headspace. A narrow-mouth jar slows loading and raises stem breakage.
Glass
Soda-lime glass is standard for Mason jars. Borosilicate glass costs 3 to 5 times more and resists thermal shock. Amber glass blocks most light below 500 nm. Clear glass lets light degrade cannabinoids. Store jars in a dark cabinet either way.
Lid
Two-piece lids: metal band plus flat lid with plastisol liner. One-piece lids: metal or plastic with a gasket. Clamp lids: glass lid plus rubber gasket plus metal clamp. Replace flat lids when the liner holds odor. Replace gaskets when they harden.
Price
16 oz clear Mason jar: $2 to $6. 16 oz amber jar: $6 to $12. Case of 12 clear jars: $18 to $35. Case of 12 amber jars: $60 to $110. Humidity packs add $1 to $2 per pack.
Pitfalls
- Cork lids leak. Cork dries and shrinks.
- Wood lids absorb odor and moisture.
- Plastic containers hold static and odor. Terpenes stick to plastic.
- Decorative jars often lack a seal test. Buy 1 jar and test it.
- Used jars can carry mold or detergent residue. Wash with hot water and unscented soap. Dry the jar and lid with a cloth.
- Dishwasher heat warps plastisol liners. Hand wash lids.
- Jars with narrow necks trap flower. Use wide-mouth jars.
- Overfilled jars crush trichomes. Keep 25% headspace.
- Clear jars on a windowsill lose potency. Light plus heat degrades THC.
Cure Setup
Fill jars to 75%. Add a 58% or 62% humidity pack. Close the lid. Keep jars at 60°F to 70°F in the dark. Open lids for 5 minutes each day in week 1. Open lids for 5 minutes every 3 days in week 2. Stop burping when humidity holds at 58% to 62% for 24 hours.