Chestnut '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.

Pholiota adiposa | USDA Certified Organic

Method Skill Level: Beginner
Species Skill Level: Beginner

Experience a taste of Japan in your own garden with our Chestnut Plant & Grow Mushroom Starter Block. This USDA Certified Organic strain produces velvety mushrooms with small-to-medium speckled caps that resemble their nutty namesake. Expect a delightful crunch, a rich nutty flavor, and a subtle woodsy aroma that enhances any dish.

Chestnut mushrooms prefer cooler, shaded spots and require steady moisture to thrive—especially during their early growth stages. When planted buried outdoors, be sure to keep humidity high by mulching with straw or leaf litter and watering regularly. While they may take a bit more care than other species, the rewarding first flush is well worth the attention. Multiple harvests are possible but may need extra nurturing.

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

Chestnut mushrooms are slow-growing and richly colored, with firm texture and nutty flavor. While they can be grown outdoors, they require a bit more patience and care than faster-fruiting species.

How to initiate fruiting outdoors:

  • Wait for color change: Allow the block to begin turning orange within the bag before initiating fruiting. This is a sign the mycelium is mature and ready.
  • Cold shock: Place the unopened bag in the refrigerator for about 8 hours before introducing it to the outdoor environment. This cold shock can help trigger pinning.
  • Pick a shady spot: Find a well-ventilated area with indirect light—beneath trees or along a north-facing wall works well.
  • Bury the block: Remove the plastic bag entirely from your block. Bury the block completely, adding about 1" of soil or mulch on top.
  • Maintain moisture: Mist regularly around the block to maintain high humidity. Be consistent—chestnuts are slow to pin and require steady conditions.

Temperature & humidity:

  • Chestnuts prefer cooler temperatures (ideally 55–65°F), so they’re better suited to spring and fall grows in most regions.
  • Avoid overly hot or dry conditions, which can stall growth.
  • These mushrooms are more sensitive to environmental shifts, so try to protect them from wind, sun, and dramatic temperature swings.

Special considerations:

  • Fruiting may take several weeks—be patient and keep humidity high during the wait.
  • The block may produce a single large flush rather than multiple smaller ones.
  • Pigment from the caps can stain lighter-colored mushrooms or surfaces if placed nearby.

Harvesting:

  • Harvest chestnuts before the veil breaks—this means the caps will still be rounded or cupped.
  • Delaying harvest can shorten shelf life and cause mushrooms to lose their firm texture.
  • Use a clean knife or gentle twist to remove clusters without damaging the block.

Chestnuts reward patience with a beautiful and satisfying harvest—rich in color, flavor, and texture.

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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.

Frequently 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.

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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