Mushrooms are not just a delicious and nutritious addition to meals but also a fascinating crop you can grow at home. This guide will teach you how to grow mushrooms from store-bought varieties like oyster mushrooms using simple materials and techniques. By following these steps, you can enjoy a continuous supply of fresh mushrooms in your home.

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Materials You Will Need

Corn kernels (or substitutes like sorghum seeds, wheat, or brown rice)
Glass jars with lids (with small holes for ventilation)

Cotton or microperforated tape (for gas exchange)
Alcohol (70% for sterilization)
A cooking pot
A funnel
Tweezers and a knife
Store-bought oyster mushrooms
A dark, cool space for incubation
Black cloth or a cardboard box (to create darkness)

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Preparation of Substrate (Corn Kernels)

Wash the Corn Kernels: Rinse the kernels thoroughly to remove soil, debris, and any fungal spores.
Boil the Kernels: Place the washed kernels in a pot of water. Bring to a boil and let them cook for 10–15 minutes. Drain excess water and allow the kernels to cool at room temperature for about 12 hours. This resting period lets any remaining spores germinate for easier sterilization.
Sterilize the Kernels: Transfer the kernels into clean jars, leaving some space for airflow. Pour a small amount of alcohol into each jar, shake well, and drain out any excess liquid. The alcohol helps eliminate contaminants.
Prepare Ventilated Lids: Cover the jar openings with a small piece of cotton or microperforated tape. This setup allows oxygen to enter while preventing spores from contaminating the substrate.
Final Sterilization: Place the jars in a pot with water up to halfway up the jars. Boil gently for 40–60 minutes, ensuring the jars don’t touch each other (use cardboard pieces as separators). Allow the jars to cool completely before use.

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Preparing and Adding Mushroom Mycelium

Select Healthy Mushrooms: Choose fresh, unopened mushrooms with intact stems. These are the best sources for healthy mycelium.
Sterilize Tools and Workspace: Clean all tools (knife, tweezers) and surfaces with alcohol. Work near a flame, if possible, to maintain sterility.
Extract the Mycelium: Cut the stem of the mushroom to reveal the inner white mycelium. Carefully scrape off the outer layer and place small pieces of the mycelium into the jars containing sterilized kernels.

Seal the Jars: Cover the jars securely with ventilated lids and store them in a dark space with temperatures between 20–24°C (68–75°F). Cover the jars with a black cloth or place them inside a cardboard box to ensure darkness.

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Incubation and Growth

Monitor Mycelium Growth: Over the next 15–20 days, the mycelium will spread, turning the kernels white. Check the jars regularly, ensuring no contamination occurs. Condensation on the jar walls is normal during this stage.
Storage of Colonized Jars: Once the kernels are fully colonized, you can store the jars in the refrigerator for up to three months. Alternatively, proceed to the next step for mushroom cultivation.

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Cultivation and Fruiting

Prepare a Growing Substrate: Use plant-based materials like wheat straw, sunflower stems, or cereal straw. Cut the material into small pieces (5–10 cm) and soak it in water for 24 hours. This allows any fungal spores or bacteria to germinate for easier elimination.
Pasteurize the Substrate: Heat the soaked substrate in water at 80°C (176°F) for 1–1.5 hours. Stir occasionally to ensure even pasteurization. Drain excess water and cool completely.
Combine Mycelium with Substrate: Layer the pasteurized substrate and colonized kernels in a growing container (e.g., a bottle or bag). Compact lightly to ensure contact between the mycelium and substrate while allowing airflow.
Create Ventilation: Drill small holes in the container and cover them with gauze to allow gas exchange. Store the container in a dark, humid environment at 20–24°C (68–75°F).
Fruiting Stage: After 90% of the substrate is colonized, expose the container to light and lower the temperature slightly. Maintain high humidity (80–90%) by misting the walls of the growing chamber. Over the next few days, mushrooms will begin to form.

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Harvest and Maintenance

Harvesting: When the mushrooms are fully grown, cut them at the base. Keep the leftover stems for replanting, as they contain active mycelium.
Replanting: Use the stems to inoculate fresh substrate for another growth cycle. This ensures a continuous supply of mushrooms.
Multiple Harvests: After harvesting, keep the container in the growing chamber for a second wave of mushrooms. Repeat the process as needed.

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Growing mushrooms at home is a rewarding and sustainable way to enjoy fresh, organic produce. With proper preparation, attention to cleanliness, and patience, you can harvest multiple batches of mushrooms from a single setup. Experiment with different substrates and enjoy the fruits (or fungi!) of your labor.

Enjoy your mushroom-growing journey and happy harvesting! 🌱🍄