Collection: Monotub Refills & BagTek Bundles

A monotub refill is a pre-measured bundle of sterile grain and substrate designed for use in monotub mushroom cultivation. It allows you to reuse your existing tub with fresh growing materials.

BagTek is a mushroom cultivation method where sterile grain is colonised and mixed directly with the substrate inside the substrate bag for further colonisation. Growers using the BagTek method then either fruit directly inside the bag or place the bag into a designated fruiting chamber.

The correct monotub refill size to choose depends on the volume of your tub and the desired substrate/grain depth. For the most accurate choice, try our Spawn & Substrate Monotub Calculator.

Our bundles are designed to work with most cultivable species of mushrooms. Our grain & CVG bundles are better suited for gourmet and exotic mushrooms, but if you are growing gourmet or functional mushrooms instead, you may want to use our Master Mix bundle.

A monotub refill is a multi-bag bundle (grain bag + substrate bag) designed for fruiting in a separate monotub, while all-in-one grow bags combine everything into a single bag for standalone use (no grain to substrate transfer necessary).

All of our monotub refill bundles are prepared fresh and sterilised before dispatch. UK orders placed before our cutoff ship the same day via the DPD next-day delivery service.