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Mushroom Grow Bags UK
Unicorn Bags for Spawn Running and Fruiting
Mushroom grow bags do two jobs: they hold your substrate while it colonises, and they hold humidity once it's time to fruit. Our Unicorn Mushroom Growing Bags are rated for pressure cooker and autoclave sterilisation up to 136degC, so you can sterilise a fresh bag of substrate straight through the bag rather than decanting it first. They come in sizes to suit 1-2lb spawn bags right up to 2-6lb fruiting or cake bags, with an injection port (Type 4T-Inj) built in for adding liquid culture or spores without opening the bag and risking contamination.
Choosing the Right Bag Size
Bag size depends on what stage you're at. Smaller 1-2lb bags with an injection port work well for spawn running, giving you a fully colonised jar or bag of grain you can use to inoculate a larger substrate later. Once you're ready to fruit, move up to a 2-6lb bulk bag so there's enough substrate and airflow for a solid flush. UK growers on a budget often buy Unicorn bags in bulk alongside a Bag Sealer, since both are reusable across multiple grows if handled carefully.
Easy Glide Bag Sealers
A good seal keeps your grow bags airtight after injecting, so contaminants can't get a foothold while your substrate colonises. Our Bag Sealers withstand pressure cooker and autoclave temperatures up to 136degC, so you can reseal a bag right after sterilising it. Whether you're running 1-2lb spawn bags or 2-6lb fruiting bags, pair the right size Unicorn bag with a sealer and an injection port for a clean, low-fuss grow from spawn to harvest. Shop the full range of mushroom grow bags and bag sealers below.