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Monotub Refill Kit – Substrate & Grain for Dung-Loving Mushroom GrowsAlready have your monotub dialed in? The Redwood Mushroom Supply Monotub Refill Kit includes everything you need to run another grow—just add spores or liquid culture. Designed as a perfect follow-up to our full monotub kit, this refill pack includes two bags of sterilized monotub mix and one bag of sterilized grain spawn, prepped and packaged for a clean, high-yield bulk grow.
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🇺🇸 Ship from USA · On Agora since 2026
$46.99