Popcorn Grain Spawn Bag — 3lb | Sterilized & Ready to Inoculate

🌽 Maximum Surface Area, Maximum Speed

Popcorn (whole kernel corn) is the grain of choice for growers who want the fastest, most aggressive colonization possible. Its large kernels have more exposed surface area and higher starch content than smaller grains, giving mycelium a rich food source it can spread across quickly — and the big kernels make it easy to visually track colonization progress right through the bag. Our 3lb sterilized popcorn spawn bag is prepped in a professional mycology facility and ready to inoculate the moment it arrives at your door — no sterilization equipment, no prep work, no guesswork.

📦 What You're Getting

• 3lb of fully hydrated, sterilized popcorn (whole kernel corn) — properly moisture-balanced for optimal mycelial colonization
• Autoclave sterilized in a professional facility to eliminate contaminants before they become your problem
• Organic, sustainably sourced grain — quality ingredients from the start

✅ Key Features

• 🌽 Popcorn (whole kernel corn) — large surface area and high starch content fuel an aggressive, fast mycelium run
• 👁️ Easy visual tracking — big kernels make colonization progress easy to see through the bag
• 🧪 Professional autoclave sterilization — no contamination headaches
• 🌿 Organic, sustainable ingredients — responsibly sourced
• 💉 Built-in self-healing injection port — clean inoculation without opening the bag
• 🌬️ 0.2 micron filter patch — reliable gas exchange that keeps contaminants out
• 📦 Ships fresh — we prep bags daily so what arrives at your door is always fresh and ready to perform

🌱 Who Is This For?

Popcorn spawn is a favorite for growers chasing the fastest possible colonization time and species that respond well to an aggressive grain run:

• Beginner growers — large kernels make it easy to see and understand how colonization is progressing
• Experienced growers — a fast-running grain for growers who want to shorten their colonization timeline

❓ How Do I Use It?

1. Flame-sterilize your needle and wipe the injection port with an alcohol swab
2. Inject your liquid culture or spore solution through the self-healing port
3. Store at room temperature in a dark location
4. Shake or break up the grain once partial colonization is visible to speed things up
5. Once fully colonized, transfer to your bulk substrate and initiate fruiting 🍄

For detailed grow guides and tips, check out our Learn page.

💯 The That Mushroom Guarantee

We stand behind every bag we sell. If something arrives damaged or contaminated, we'll make it right — no hassle, no runaround.