Grow Mushrooms in a Jar or Bag on Your Bookshelf
If you’re a complete beginner with no prior experience in mushroom cultivation, growing mushrooms in a jar or bag on your bookshelf is an excellent starting point. This method is ideal for small spaces, requires minimal setup, and allows you to enjoy fresh, homegrown mushrooms in just a few weeks. While it’s not the most advanced technique, it’s a great way to learn the basics without the complexity of larger setups. Success is possible, but it’s important to be realistic: you may encounter some challenges, like contamination or slow growth, but with the right approach, you can enjoy a bountiful harvest.
What you’ll need
To grow mushrooms in a jar or bag, you’ll need the following:
- All-in-one mushroom grow bag or jar: These are pre-sterilized substrates with added spawn, often containing oyster mushrooms, shiitake, or reishi. Prices range from $10 to $25 per unit, depending on the brand and size.
- A dark, cool, and stable location: A bookshelf or cabinet is ideal, as it provides a quiet, dust-free environment.
- A small container or tray (optional): To catch any excess moisture or spores that may drip from the jar/bag.
- A permanent marker or label: To mark the jar/bag with the date you opened it, as this helps track the growth stage.
Total cost estimate: $10–$25 (depending on the brand and size of the grow kit).
Which mushrooms work best here
The best mushrooms to grow in a jar or bag are those that thrive in a controlled, low-maintenance environment. Here are the top choices:
- Oyster mushrooms (Pleurotus spp.): These are the most common and easiest to grow in jars or bags. They grow quickly, have a mild flavor, and are great for beginners.
- Shiitake mushrooms (Lentinula edodes): These are slightly more advanced but still suitable for a jar or bag setup. They require a bit more humidity and patience, but the reward is a rich, umami flavor.
- Reishi mushrooms (Ganoderma lucidum): These are more challenging and require a higher level of care, but they are worth the effort for their medicinal properties and unique flavor.
Each of these mushrooms has its own set of growing conditions and timelines, which are detailed in our per-species guides.
Step by step
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Choose your grow kit: Select a pre-sterilized jar or bag with the mushroom spawn already added. Oyster mushrooms are the most beginner-friendly, but you can also choose shiitake or reishi if you’re up for a bit more challenge.
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Prepare your workspace: Clean your hands and work area to minimize the risk of contamination. Use a clean surface, like a countertop or table, to avoid introducing unwanted microbes.
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Place the grow kit in a dark, cool spot: A bookshelf or cabinet is perfect. Ensure the location is away from direct sunlight, heat sources, and high traffic areas. The ideal temperature range is 60–75°F (15–24°C).
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Monitor the kit for signs of growth: After a few days, you should see small white mycelium growth inside the jar or bag. This is the mushroom’s root system. It may take 7–14 days for the first pins (young mushrooms) to appear.
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Keep the environment humid: Mist the jar or bag lightly with water if the air is dry. Avoid over-misting, as this can lead to contamination. You can use a spray bottle with clean water to maintain humidity levels.
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Wait for the mushrooms to mature: Once the pins appear, they will grow into full mushrooms in 5–10 days. Oyster mushrooms typically take about 10–14 days to mature, while shiitake and reishi may take longer.
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Harvest when the mushrooms are fully developed: Use a clean pair of scissors or a knife to cut the mushrooms at the base. Avoid pulling them out, as this can damage the mycelium and reduce future yields.
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Store the mushrooms properly: If you don’t use them immediately, store them in the refrigerator in a paper bag or container. They should last up to a week. For longer storage, you can freeze them after cooking.
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Dispose of the used grow kit: After harvesting, you can compost the used jar or bag or dispose of it in the trash. Do not reuse the substrate, as it may contain harmful spores or contaminants.
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Repeat the process if desired: If you want to grow more mushrooms, you can purchase another grow kit or try to reuse the jar/bag with a new substrate (though this is not recommended for beginners).
By following these steps, you’ll be well on your way to growing your first batch of mushrooms in a jar or bag on your bookshelf. With patience and attention to detail, you can enjoy the satisfaction of homegrown, gourmet mushrooms.
Conditions that matter
To ensure your mushrooms grow successfully in a jar or bag on your bookshelf, you’ll need to maintain specific environmental conditions. These are critical for the mycelium to colonize the substrate and for the fruiting bodies to develop properly.
- Temperature: Keep the jar or bag in a location with stable temperatures between 65°F and 75°F (18°C to 24°C). Avoid placing it near heat sources like radiators or in direct sunlight.
- Humidity: The environment should be high humidity (around 85–95%), which can be achieved by placing the jar or bag on a tray of water or using a humidifier.
- Fresh Air: While mushrooms don’t need direct light, they do require fresh air. Open the jar slightly or place the bag in a well-ventilated area to allow for air exchange. Avoid placing the jar or bag in a sealed container.
- Light: Mushrooms do not need direct light, but a small amount of indirect light (like from a window) can help trigger fruiting. However, too much light can inhibit growth, so keep it minimal.
Timeline
Here’s a week-by-week breakdown of what to expect when growing mushrooms in a jar or bag on your bookshelf:
- Day 1–3: The jar or bag will be sealed, and the mycelium will begin colonizing the substrate. You may not see much activity yet.
- Day 4–7: The mycelium should be fully colonized, and the first signs of mushroom formation (pins or small mushrooms) may appear.
- Day 8–14: The mushrooms will grow rapidly, reaching full size in about 10–14 days, depending on the species.
- Day 15–21: Harvest the mushrooms when they are fully developed and ready to eat.
Harvesting, storing & cooking
- When to harvest: Harvest your mushrooms when they are fully developed, which is when the caps are fully open and the stems are firm. This is usually around 10–14 days after the kit is opened.
- How to harvest: Use a clean pair of scissors or a knife to cut the mushrooms at the base. Avoid pulling them out, as this can damage the mycelium and reduce future yields.
- Storing: If you don’t use them immediately, store the mushrooms in the refrigerator in a paper bag or container. They should last up to a week. For longer storage, you can freeze them after cooking.
- Cooking: Mushrooms can be cooked in a variety of ways—sautéed, grilled, added to soups, or used in stir-fries. They have a meaty texture and a rich umami flavor, making them a great addition to any dish.
Troubleshooting
| Problem | Cause | Fix |
|---|---|---|
| Contamination | Poor hygiene, unclean environment, or improper sealing | Keep the jar or bag in a clean, dry place. Avoid touching the substrate with dirty hands. |
| Dryness | Low humidity, lack of air exchange | Place the jar on a humidifier or a tray of water. Ensure the environment is moist and well-ventilated. |
| No pinning or fruiting | Insufficient humidity, incorrect temperature, or lack of fresh air | Increase humidity, maintain the correct temperature, and ensure the jar or bag is in a well-ventilated area. |
| Odor or mold | Contamination or over-hydration | Discard the jar or bag if the smell is off or if mold appears. Do not consume any contaminated mushrooms. |
| Mushrooms not growing | Poor colonization or incorrect conditions | Check the temperature and humidity. Ensure the jar or bag is not sealed too tightly. |
Food safety
- Positive ID: Always identify your mushrooms correctly before eating. Even if you know the species, it’s important to confirm the identity to avoid accidental poisoning.
- Cook thoroughly: Mushrooms should be cooked to an internal temperature of 165°F (74°C) to kill any harmful bacteria or parasites.
- Who should be cautious: Pregnant women, young children, and people with weakened immune systems should avoid eating raw or undercooked mushrooms. Always cook them thoroughly.
FAQ
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Can I grow mushrooms in a jar or bag on my bookshelf?
Yes, many all-in-one kits are designed for countertop growing and are perfect for beginners. -
How long does it take to grow mushrooms in a jar or bag?
It typically takes 10–14 days for mushrooms to fully develop, depending on the species and environmental conditions. -
What should I do if my mushrooms don’t grow?
Check the temperature, humidity, and air exchange. Ensure the jar or bag is not sealed too tightly and that the environment is clean and moist. -
Can I reuse the jar or bag for another grow?
It’s not recommended for beginners. The substrate may be contaminated, and reusing it can lead to poor results or contamination. -
What should I do if I see mold or an odd smell?
Discard the jar or bag immediately. Contamination can spread quickly, and it’s not safe to eat any affected mushrooms. -
How should I store the mushrooms after harvesting?
Store them in the refrigerator in a paper bag or container. They should last up to a week. For longer storage, freeze them after cooking. -
Can I cook the mushrooms immediately after harvesting?
Yes, they can be cooked immediately. However, they are best used within a few days of harvesting for optimal flavor and texture.
Sources & further reading
- Mushroom Growing Kits Guide – Mushroom Growers Association
- Home Mushroom Cultivation – American Mushroom Cultivators
- Growing Gourmet and Medicinal Mushrooms – David Arora (book)
- The Mushroom Cultivator – Stu Campbell (book)
- Mushroom Growing Tips – Grow Your Own Mushrooms
By following these steps and tips, you’ll be well on your way to successfully growing gourmet mushrooms in a jar or bag on your bookshelf. With patience and attention to detail, you can enjoy the satisfaction of homegrown, healthy, and delicious mushrooms.
More in the Grow Series
New to growing? Start with a grow kit. Then explore the rest of the series: – Build A Martha Tent For Year Round Mushroom Growing – The Monotub Method Grow Mushrooms Start To Finish – Grow Wine Cap Mushrooms In Your Garden Bed – Outdoor Log Cultivation Shiitake And Lion S Mane – All Grow Guides
Educational Disclaimer
This article is for informational and educational purposes only. It is not medical advice, mental health advice, diagnosis, treatment guidance, or a recommendation to use any substance, supplement, therapy, or protocol.
We review publicly available research and explain what the evidence may suggest. Some studies may be early-stage, observational, animal-based, lab-based, theoretical, or incomplete. Always consult a qualified professional before making health-related decisions.
Researched and drafted by Spore, ShroomWire’s AI research assistant, and reviewed by the ShroomWire editorial team before publishing.
