24oz Quick-Colonizing Grain Jars (3-Pack) | 5-Grain Spawn – Midwest Grow Kits
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3-Pack Premium 24 Oz Super-Quick-Colonizing 5-grain Jar (24oz)

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Three sterilized 24oz tapered jars of quick-colonizing 5-grain spawn, our fastest jar at about 14–20 days to colonize. Self-healing ports and 0.22 micron filter disks.

🔥 703 purchased in the last 30 days
⭐ 10000+ units sold

Description

Our Super Quick-Colonizing 24oz 5-Grain Jars are the fastest-colonizing grain jars we sell — three custom tapered glass jars of 5-grain spawn with a high ratio of smaller grains, averaging about 14–20 days to full colonization.

The smaller jar and grain mass colonize faster than a standard 32oz jar, and the tapered shape lets the finished grain cake slide right out when it is time to spawn to bulk. Every lid has a self-healing injection port and a 0.22 micron filter disk.

  • Fastest-colonizing jar
  • Tapered glass
  • 5-grain blend
  • Self-healing port
  • 3 jarsPer pack
  • 24ozTapered glass
  • 14–20 daysAvg. colonization
  • 0.22 µmFilter disk
  • 4–6ccLiquid culture

Why growers pick the 24oz jars

  • Fastest colonization we offer – Smaller jar, smaller grain mass and a high ratio of small grains — about 14–20 days on average.
  • Tapered glass – The colonized grain cake slides out cleanly instead of being dug out of the jar.
  • Fortified hydration – Mineral water with gypsum and diammonium phosphate.
  • Clean inoculation – Self-healing injection port and a 0.22 micron filter disk on every lid.
  • Built for bulk – Colonized grain breaks up and spreads evenly through bulk substrate.
24oz quick-colonizing 5-grain jar colonization timeline

What's in the pack

  • Three 24oz tapered glass jars
  • Rye berries, white milo, red milo, white millet, red millet, with a high ratio of smaller grains (5-grain blend)
  • Self-healing injection port and 0.22 micron filter disk on every lid
  • Pressure-sterilized at 15 PSI for 3 hours

How to use them

  1. Prep. Wipe the injection port with alcohol and use a sterile needle and syringe.
  2. Inoculate. Inject 3–4cc of spore solution or 4–6cc of liquid culture through the self-healing port.
  3. Incubate. Keep the jar warm, out of direct light and undisturbed until mycelium is clearly growing.
  4. Shake. At about 25–30% colonization, shake the jar to break up the grain and spread the mycelium, then let it finish.
  5. Spawn to bulk. Once the jar is fully white, break it up and mix it evenly into bulk substrate in your monotub.

From jar to bulk monotub

Inoculating a grain jar, letting it colonize, breaking it up and mixing it into bulk substrate for a monotub grow:

Spawn Bag and Grain Jar Guide for mushroom cultivation

New to grain spawn? Our Spawn Bag & Grain Jar Guide walks through inoculating, incubating and fully colonizing grain jars and spawn bags step by step.

How many jars per monotub?

Plan on 2–3 jars per 5 lbs of bulk substrate. By tub size:

Monotub Bulk substrate 32oz jars 24oz jars
Small 28Q About 4 lbs 1 2
Medium 44Q 7.5 lbs 2–3 3–4
Large 66Q 10 lbs 2–4 4–6

Compare our grain jars

Jar Grain Jar style Liquid culture Per 5 lbs substrate Best for
Premium 5-Grain 32oz Rye, milo & millet blend Wide-mouth glass 5–7cc 1–2 jars More inoculation points
Super Quick 5-Grain 24oz (this jar) 5-grain, extra small grains Tapered glass 4–6cc 2–3 jars Fastest colonizing; cake slides out
Original Rye 32oz Rye berries Wide-mouth glass 5–7cc 1–2 jars Classic single-grain spawn

Specifications

Specification Detail
Jar 24oz tapered glass
Pack size 3 jars
Grain Rye berries, white milo, red milo, white millet, red millet, with a high ratio of smaller grains
Hydration Mineral water fortified with gypsum and diammonium phosphate
Filter 0.22 micron filter disk
Injection port Self-healing, for spores or liquid culture
Sterilization Pressure-sterilized at 15 PSI for 3 hours
Average colonization About 14–20 days
Inoculation Spores 3–4cc or liquid culture 4–6cc per jar
Bulk ratio 2–3 jars per 5 lbs of bulk substrate
Shelf life Best within 90 days; up to 120 days refrigerated

Storage: Every jar is made fresh. Inoculate within 90 days for best results, or refrigerate uninoculated jars to keep them up to 120 days.

Pair it withSpawn colonized jars into Select Bulk Substrate. Going bigger? Our Premium 5-Grain Spawn Bags hold a full Medium 44Q worth of spawn per bag.

FAQ

What grains are in the 5-grain blend?

Rye berries, white milo, red milo, white millet and red millet. The 24oz blend uses a higher ratio of the smaller grains for more inoculation points.

How much spore solution or liquid culture per jar?

3–4cc of spore solution or 4–6cc of liquid culture, injected through the self-healing port after wiping it with alcohol.

How long do the 24oz jars take to colonize?

About 14–20 days on average. The smaller jar and higher ratio of small grains usually colonize faster than a 32oz jar. Strain, temperature and inoculant all affect timing.

When should I shake the jar?

At about 25–30% colonization. Shake to break up the grain and spread the mycelium, then let the jar finish colonizing.

How many jars do I need for my monotub?

Plan on 2–3 jars per 5 lbs of bulk substrate. That works out to about 2 jars for a Small 28Q, 3–4 for a Medium 44Q and 4–6 for a Large 66Q.

How long do uninoculated jars keep?

They are made fresh. Use them within 90 days for best results, or refrigerate them to keep them up to 120 days.

Why is the jar tapered?

The tapered glass lets the fully colonized grain cake slide out more easily when it is time to break it up and spawn to bulk.