Blue Oyster 'Plant & Grow' Mushroom Starter Block

1-Pack
$29.99

Garden with mushrooms the easy way!

  • As easy as planting a tomato start
  • Plant it right next to your vegetables or herbs
  • Harvest mushrooms in as little as two weeks

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Pack Size

In Stock. Ships in 2-5 business days.

Pleurotus ostreatus | USDA Certified Organic

Method Skill Level: Beginner
Species Skill Level: Beginner

Looking to add gourmet flavor to your garden with minimal effort? Our Blue Oyster Plant & Grow Mushroom Starter Block makes it easy. This USDA Certified Organic strain grows beautiful clusters of bluish-gray to brownish-gray mushrooms that emerge right from the soil. With their rich umami flavor and tender, meaty texture, Blue Oysters are a versatile kitchen staple—perfect for sautés, stir-fries, and more.

Blue oysters are known for being beginner-friendly and highly productive. Once planted outdoors, they can produce large flushes of mushrooms with little care. And if the conditions are right, you may enjoy a second (or even third) round of harvests.

Receiving & Storage

Remove starter from the shipping box as soon as possible. Then, unfold the top of the bag, making room for air space. It's also important to check and confirm that the filter patch is not obstructed. This will help the organism breathe and continue to thrive!

Plant & Grow starters should be used within 1 week of receipt. If you don't plan to use immediately, you can refrigerate your block for up to 6 months.

How to Grow

Oyster mushrooms are vigorous, fast-growing, and perfect for new outdoor cultivators. With their dramatic colored caps and savory flavor, they bring both beauty and bounty to shaded garden spaces.

How to Initiate Fruiting Outdoors

  • Choose a shaded location: Find a cool, humid spot like under trees, beside a fence, or in a sheltered garden bed.
  • Bury your block: Remove the plastic entirely from your block. Bury the block completely and cover with about 1" of soil or mulch.
  • Maintain consistent moisture: Mist the surrounding soil or mulch regularly (1–2x daily in dry weather) to prevent the block from drying out.

When to Plant

  • Most Oysters thrive in cooler temperatures (ideally 55–65°F), and Pink Oysters like it a little warmer (ideally 70-80°F ).

Special Considerations

  • Watch for rapid growth—oysters can mature quickly and drop spores if not harvested in time.
  • Consider placing straw or leaf mulch around (not on) the block to help regulate humidity without suffocating airflow.

Harvesting

  • Pick clusters when cap edges are still curled under for best texture, flavor, and shelf life.
  • Harvest young to reduce spore production and improve storage.
  • Use both hands or a clean knife to gently remove entire clusters without damaging the substrate.

With minimal effort, oysters will often produce multiple flushes—making them one of the most rewarding mushrooms to grow in the garden.

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Bury. Water. Harvest.

No complicated setup, just a simple method designed for outdoor gardens.

Pick your spot

Choose a shaded area with soil or mulch. Dig a hole about the size of the starter block, deep enough so it can be fully covered once placed. A cool, protected spot will give you the best results.

Plant the block

Remove the mushroom starter from its bag and place it in the hole. Fill in the sides with soil so there are no gaps, then cover the top with a couple inches of wood chips to help retain moisture.

Watch it grow

Water after planting and keep it lightly watered, especially on dry days. In as little as 1 to 2 weeks, mushrooms begin to appear. Harvest fresh clusters right from your garden.

Frequency Asked Questions

Yes. Plant & Grow blocks are designed for real garden beds. If you can grow vegetables, you can grow mushrooms right alongside them — and they can help support healthier soil and stronger plants over time.

It’s as easy as planting a seedling. Just bury the block, water lightly, and let it grow. No complicated setup or special tools required.

Plant it in shaded areas, along garden edges, or right next to your vegetables and herbs. Anywhere your garden already gets consistent watering works well.

You can start harvesting in as little as two weeks, depending on the variety and conditions. It’s one of the fastest ways to harvest from your garden.

Yes. Mushrooms are resilient and grow in a wide range of climates. If your garden supports vegetables, this will work for you. Plant & Grow varieties are easy to recognize, and look-alikes are unlikely to grow in a garden setting.

Cluster of brown-capped mushrooms with long, light-colored stems against a white background.

Backed by Our 100% Grow Guarantee

Every kit comes with our 100% Guarantee: You’ll get your first flush of mushrooms, or we’ll make it right. With over 350,000 happy growers, North Spore is trusted by hobbyists, chefs, and mycologists alike.

Crafted to the Highest Standards

Our mushroom spawn is made to mycologist-approved standards at every step of the way. Starting with USDA-Certified Organic ingredients, we mix each bax of substrate to perfect. We inoculate our products in a custom-built mushroom lab, in clean rooms that have more oxygen exchanges per hour than a hospital operating room. Every bag is carefully monitored for full colonization and the best product is hand-selected to ship to our customers.

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