• Stacked refill kit components against stylized cosmic background: milo grain bag on top of two CVG substrate blocks.
  • Vacuum‑sealed clear bag of sterile 5 lb milo grain with front injection port resting atop two sealed 10 lb CVG substrate blocks.
  • Close-up of barehands holding moist CVG substrate block, highlighting texture of coco‑coir, vermiculite, gypsum blend.
  • Shot of a 5 lb bag of not so simple substrate, mushroom substrate
  • 5-pound bag of milo (sorghum) grain in Unicorn bag
1 5

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Extra Large Monotub Refill Kit – Sterile Grain Spawn & CVG Substrate

Extra Large Monotub Refill Kit – Sterile Grain Spawn & CVG Substrate

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$39.99
$39.99
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Extra Large Monotub Refill Kit – Built for Bigger Runs

5 lb Sterile Milo + 10 lb CVG Substrate — Vacuum-Sealed & Ready to Run

Restock Fast. Keep It Clean.
The Extra Large Monotub Refill Kit makes it easy to reload your setup with high-quality essentials. Includes a 5 lb sterile Milo grain bag and a 10 lb CVG substrate block, both vacuum-sealed and prepped for consistent performance. Fruit in a monotub or directly in the bag — your workflow, your choice.

What's Included

  • 5 lb Sterile Milo Grain Bag – Hydrated, pressure-sterilized, sealed with self-healing injection port and filter patch
  • 10 lb CVG Substrate Block – Pasteurized coir/vermiculite/gypsum blend, hydrated to field capacity

Why Growers Choose This Kit

  • Perfect for restocking existing monotubs
  • Flexible fruiting options: monotub or in-bag
  • Small-batch prepared for consistency
  • Clean, vacuum-sealed packaging

Quick Start Guide

Step Instructions
1. Inoculate Clean injection port with 70% isopropyl alcohol. Inject 4–10 mL of liquid culture or spore syringe. Gently shake to distribute.
2. Colonize Store at 70–75°F in a clean, dark area. Once 30–70% colonized, mix (optional) to accelerate growth. Full colonization typically takes 10–18 days.
3. Combine Mix colonized grain with the 10 lb CVG substrate. Combine inside a monotub or directly in the bag. Gently level the surface.
4. Incubate Maintain 70–75°F in indirect light. Allow 5–10 days for full substrate colonization.
5. Initiate Fruiting Introduce light and fresh air. Crack the tub lid or cut small slits in the bag and cover with micropore tape if needed.
6. Mist & Monitor Mist tub walls or bag interior as needed. Pins typically appear in 5–7 days once fruiting conditions are introduced.

Storage & Shelf Life

  • Store sealed between 45–70°F until ready
  • Best used within 15–30 days of receipt
  • Do not freeze; refrigerate fully colonized grain only if necessary
  • Timeframes vary depending on genetics and environment
✅ For legal gourmet/culinary/medicinal mushroom cultivation only. This kit is intended exclusively for growing edible gourmet, culinary, and medicinal mushroom species. Not intended for any illegal use.

Don't Forget Your

Replacement Monotub Filters

Apply to your fruiting chamber to give your substrate fresh air while maintaining high humidity levels.

Real Results from Real Growers

4.9 ★ (819)
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