Grow Sow Greener
Blue Oyster – Plate & Liquid Cultures, Plug & Grain Spawn
Blue Oyster – Plate & Liquid Cultures, Plug & Grain Spawn
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Blue Oyster (Pleurotus ostreatus var. columbinus) produces striking navy-blue pins that mature to steel-grey caps. Cool-loving, high-yield and quick to colonise, it’s a favourite for colourful farmers-market displays and rich umami sautés.
Blue Oyster Culture Range — Quick View
| Product | Snapshot & Ideal Use |
|---|---|
| Liquid Culture (10 ml syringe) | Fast-colonising Blue Oyster mycelium for rapid grain inoculation and vivid blue primordia. |
| Agar Plate Culture (90 mm PDA) | Pre-colonised plate for cloning, sectoring or agar-to-grain transfers—check pigment and vigour before scaling up. |
| Grain Spawn (1.5 kg bag) | Fully colonised UK grain with injection port—plug-and-play for supplemented sawdust blocks; ideal for cool-season grows. |
| Plug / Dowel Spawn (8 × 35 mm Schima superba) | Hardwood dowels colonised with Blue Oyster—great for outdoor logs or buckets in temperate climates. |
Blue Oyster Liquid Culture – 10 ml Syringe
Pleurotus ostreatus var. columbinus | UK Grown | Cool-Climate Strain
Selected for deep-blue pins that hold colour, dense clusters and cold-weather tolerance. Each syringe contains vigorous mycelium in nutrient-rich broth produced under ISO-class sterile lab conditions.
Included
1 × 10 ml syringe of Blue Oyster liquid culture
1 × sterile needle
1 × alcohol wipe
Usage & Storage
Shake well, inject into sterilised grain (20 – 24 °C), incubate until colonised, then spawn to supplemented sawdust blocks. Refrigerate 2 – 6 °C; best within 2 – 3 weeks, viable up to 2 months.
Blue Oyster Plate Culture – 90 mm PDA Agar
Fully colonised plate—ideal for cloning, sectoring or immediate agar-to-grain transfers with visual pigment confirmation.
Included
1 × 90 mm Blue Oyster agar plate
Usage & Storage
Transfer wedges in a SAB/flow hood to grain or fresh plates. Refrigerate 2 – 6 °C; use within 3 weeks (max 6 weeks).
Blue Oyster Grain Spawn
1.5 kg Unicorn-style bag of millet/rye colonised by Blue Oyster—built for rapid colonisation and rich-coloured flushes in cool rooms.
Usage & Storage
Break up, mix into supplemented sawdust (e.g. 50:50 hardwood sawdust + bran) at 10 – 15 % spawn. Incubate 20 – 24 °C; fruit blocks at 15 – 18 °C with high RH for best colour. Refrigerate 2 – 6 °C; best within 10 days, viable up to 4 weeks.
Blue Oyster Plug / Dowel Spawn – Hardwood Dowels (8 × 35 mm Schima superba)
Perfect for outdoor log or bucket grows in spring and autumn—each dowel is vacuum-sealed for freshness.
Why Choose Plug Spawn?
- Cool-season star—fruits when summer oysters fade
- Low-tech—needs only a drill bit, sealing wax & applicator
- Market appeal—eye-catching blue clusters boost stall traffic
Usage & Storage
- Drill 8 mm holes to the correct depth with our mushroom drill bit.
- Insert plugs, seal with log wax.
- Use hardwood felled within 3 months.
- Incubate logs/buckets in shade at 15 – 20 °C; first flush in 6 – 9 months.
Store plugs refrigerated (2 – 6 °C); best within 4 weeks, viable up to 3 months.
Shipping
Shipping
Delivery Costs
Our shipping is broken down into two categories and are dispatched the same or next day as standard.
1. Unlimited "Small" (Garden) Seed Packets:
- Including wooden plant markers and sprouting bags.
- £1.99 - Standard Delivery 2 - 4 business days.
- £4.90 Express Delivery 1 - 3 business days
2. Everything Else - Sprouting and Microgreen Seeds, Growing Equipment, Gifts and Grow Kits:
UK Mainland.
- £3.85 - Standard Delivery (2 - 4 business days) on orders between 0 and 2kg.
- £6.50 - Next Day Courier Service on orders 0 - 4.5kg.
- £8.95 - Next Day Courier Service on orders over 4.5kg.
- Contact us for a quote on orders over 26kgs.
Ireland, Northern Ireland, Isle of Man, Guernsey and Jersey.
- £9.45 - Standard Delivery (2 - 4 business days) on orders between 0 and 2kg.
- £23.50 - Standard Delivery on orders 2kg - 26kg.
- Contact us for a quote on orders over 26kg.
The EU, Switzerland and Rest of World.
Get in touch for equipment sales to the EU and the rest of the world for a competitive shipping quote. Unfortunately we cannot yet post seeds outside the UK.
Delivery and Packaging
All products are packaged plastic free as standard. Your garden seeds are sealed for freshness inside white glassine envelopes which are a water/vapour resistant compostable paper product whilst your Microgreen and Sprouting Seeds arrive in resealable zip lock pouches made from GMO free vegetable starch which are further heat sealed to ensure these great products reach you safely!
Returns Policy
Returns Policy
We hope you are loving your purchase however we understand that sometimes things don't go as planned and returns and refunds are necessary. Please refer to the following return and refund policies at growsowgreener.co.uk.
My product is damaged defective or you shipped me the wrong product.
We're sorry about that and understand your frustration! We would love to offer you a refund or a replacement. Please contact us at hi@growsowgreener.co.uk within 30 days of purchase for a full refund or replacement.
I ordered the wrong product or simply changed my mind.
No worries, we will refund you the full amount (minus the shipping charges) provided the items are returned in new condition and in original packaging. Once received we will issue your refund however you will be responsible for return shipping costs for non defective products.
Please post to:
Grow Sow Greener
RETURNS (order number)
5 Longfields
West Alvington
Devon TQ73QG
UK
Guaranteed to grow promise.
Should you have absolutely any problems issues or difficulties getting your seeds to germinate or problems/queries regarding our grow kits or equipment, please get in touch at hi@growsowgreener.co.uk and we will strive to help you out via email, call or video call.
All our seeds and products have been tested here by us however if we still cant help you get growing we will offer a free replacement.
Unfortunately, we cannot accept returns on gift cards.
