How long does a mushroom kit last?

Unopened and stored in the refrigerator (ideally at 3–5°C), our magic mushroom grow kits will remain in “hibernation mode” for 3–4 weeks. You’ll also want to keep the grow kit inside an airtight plastic bag to prevent contamination. Opening the grow kit kickstarts the growing process, so you’ll need to follow the steps outlined in the instructions or risk a failed harvest.