Welcome to your Oyster Mushroom instructions - we're super excited to get you going.
You can get growing within three days of receipt, however, if you're not wanting to grow immediately you can put your kit in your fridge for up to one mont, your mushrooms may begin to grow even when chilled so we advise to get started asap.
Equipment needed: A water mister.
PLEASE DO NOT REFRIGERATE YOUR PINK OYSTER KITS - THESE NEED TO BE STARTED ONCE RECEIVED.
Ideal growing temperature parameters are 17-22 degrees. Lower temperatures can mean slower growth and higher temps can lead to the substrate and mushrooms drying out - to avoid this you can increase your watering routine during the day and growing period.
Getting going:
You will have received a fully colonised substrate grow block within a sealed grow bag. The white patch is a filter patch. The top of the grow bag will be taped down around the substrate block. Do not un-tape it. This is to make sure there are no other areas for your mushrooms to grow, ensuring they’ll grow from the opening you’re about to make in the grow bag.
Open your kit with very clean scissors, carefully cut the grow bag in a single diagonal line approx.15-20cm across the front of your substrate block. Do not carve, dig or scratch into substrate surface, and do not peel back the opening of the grow bag.
This opening will allow enough air and water into the substrate to initiate fruiting. Please trust the process.
Place your kit in a light position and out of direct sunlight. Mist the opening of your kit twice a day with water. You can expect to see the primordia of your mushrooms forming within 14 days. Your mushrooms will be ready to harvest 5-7 days later.
Should there be any delay in your primordia forming within the stated times do contact us at enquiries@caleybrothers.co.uk with photos so we can advise on the health and wellbeing of your kit.
Continue to water your mushrooms once they begin to form and until you harvest them, give a light misting twice a day during the growing phase.
Harvest your mushrooms once the largest in the flush begin to flatten out at the edge of the mushroom and before they begin to dry out.
Remove all mushrooms at once, the smaller mushrooms will not continue to grow once some have been harvested.
Harvest each cluster of mushrooms close to the substrate base, remove any lumps of mushroom from the kit to prevent spoiling.
Continue to mist your kit twice a day in between harvests. Your second and subsequent flushes will take a little longer to appear but persevere with watering to encourage growth of fresh primordia. Your kits should continue to smell fresh and healthy and looking well with lots of healthy white mycelium growth all over.
When you have finished growing: Remove your substrate from the plastic bag - you can recycle the plastic at any large supermarket facility.
Your fruiting block should be left to dry out then disposed of into your household waste. We do not recommend composting or putting substrates into your garden, compost or food waste.
You can read more about this HERE.
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Congratulations and we hope you enjoy your grow. If you have any questions or curiosities please do emails us at enquiries@caleybrothers.co.uk and we'll get back to you with 48 hours.
Otherwise, do feel free to take a look at other mushrooms you might enjoy growing and eating, we have a variety of options - all delicious and all just as easy to grow.
Where to next?
→ Get our book - Project Mushroom
→Join us online at one of our workshops this autumn
→ Follow us on Substack for new posts twice a month
Happy growing x
Ⓒ Caley Brothers 2026
