How to Grow and Cook Blue Oyster Mushrooms: A Complete Guide

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Blue oyster mushrooms are a delicious and nutritious type of edible fungi that can be easily grown at home or bought from the market. They have a meaty texture, a mild flavor, and a striking blue color that fades to gray as they mature.

In this article, you will learn everything you need to know about blue oyster mushrooms, including their benefits, how to grow them, how to harvest them, how to store them, and how to cook them. You will also find some tasty recipes that feature blue oyster mushrooms as the main ingredient.

What are Blue Oyster Mushrooms?

Blue oyster mushrooms are a subspecies of oyster mushrooms, which belong to the genus Pleurotus. Their scientific name is Pleurotus ostreatus var. columbinus. They are also known as blue pearl oyster mushrooms, blue-gray oyster mushrooms, or simply blue oysters. They are native to Europe and Asia, but they can be cultivated in many parts of the world.

Growing Blue Oyster Mushrooms: Habitat, Characteristics

Blue oyster mushrooms grow in clusters on dead or dying hardwood trees, such as beech, birch, oak, or maple. They have a fan-shaped cap that resembles an oyster shell, hence their name. The cap can range from 2 to 10 inches in diameter and has a smooth surface.

The gills are white or cream-colored and run down the stem. The stem is usually short and thick, but it can be longer and thinner if the mushrooms grow in a high carbon dioxide environment.

Blue oyster mushrooms have a distinctive blue hue when they are young, but they lose their color as they age and become exposed to light. They turn from blue to gray to brown over time. The color change does not affect their taste or quality, but it may make them less appealing to some consumers.

What are the Benefits of Blue Oyster Mushrooms?

Blue oyster mushrooms are not only tasty, but also healthy. They are low in calories, fat, and sodium, but high in protein, fiber, vitamins, minerals, and antioxidants. They have several health benefits, such as:

Boosting the immune system

Blue oyster mushrooms contain beta-glucans, which are polysaccharides that stimulate the production of white blood cells and enhance the body’s defense against infections and diseases.

Lowering cholesterol levels

Blue oyster mushrooms contain lovastatin, which is a natural statin that inhibits the enzyme that produces cholesterol in the liver. They also contain ergosterol, which is a precursor of vitamin D that helps regulate cholesterol metabolism.

Improving brain function

Blue oyster mushrooms contain ergothioneine, which is a powerful antioxidant that protects the brain cells from oxidative stress and inflammation. They also contain niacin, which is a vitamin B3 that improves blood circulation and cognitive performance.

Supporting bone health

Blue oyster mushrooms are rich in calcium, phosphorus, magnesium, and vitamin D, which are essential for bone formation and maintenance. They also help prevent osteoporosis by increasing bone density and reducing bone loss.

Fighting cancer

Blue oyster mushrooms have anti-tumor properties that inhibit the growth and spread of cancer cells. They also induce apoptosis, which is the programmed cell death of abnormal cells. They also modulate the immune system and enhance its ability to fight cancer.

How to Grow Blue Oyster Mushrooms?

Growing blue oyster mushrooms at home is easy and rewarding. You can grow them indoors or outdoors using different methods and substrates. Here are some steps to follow:

Choose your method

You can grow blue oyster mushrooms using ready-made kits or spawn bags that you can buy online or from local suppliers. These kits or bags contain sterilized substrates inoculated with mushroom spawn (mycelium). All you need to do is follow the instructions on how to set up and maintain your mushroom kit or bag.

Alternatively, you can grow blue oyster mushrooms using your own materials and substrates. You will need mushroom spawn (mycelium), pasteurized straw or sawdust (or other organic materials), plastic bags or containers with holes for ventilation, and a spray bottle with water.

Choose your substrate

The substrate is the material that provides nutrients and support for the mushroom growth. Blue oyster mushrooms can grow on various substrates, such as straw, sawdust, wood chips, paper waste, coffee grounds, cardboard, cotton waste, or corn cobs.

You can use one type of substrate or mix different types together. The substrate should be moist but not soggy and should have a pH between 6 and 7.

Prepare your substrate

If you are using straw or sawdust as your substrate, you need to pasteurize it first to kill any contaminants that may interfere with the mushroom growth. You can pasteurize your substrate by soaking it in hot water (around 160°F) for an hour or by steaming it for 90 minutes.

Then, drain the excess water and let the substrate cool down. If you are using other types of substrates, such as paper waste or coffee grounds, you can skip this step.

Inoculate your substrate

Inoculation is the process of introducing the mushroom spawn (mycelium) into the substrate. You can do this by mixing the spawn with the substrate evenly or by layering them alternately in a plastic bag or container.

Make sure to leave some space for air and gas exchange. Seal the bag or container and poke some holes for ventilation. Label the bag or container with the date and the type of mushroom.

Incubate your substrate

Incubation is the period when the mushroom spawn (mycelium) colonizes the substrate and forms a white network of fibers. You need to keep your inoculated substrate in a dark, warm, and humid place, such as a closet, a basement, or a cabinet.

The ideal temperature for blue oyster mushrooms is between 65°F and 75°F. The ideal humidity is between 80% and 90%. You need to check your substrate regularly and mist it with water if it looks dry. The incubation period can take from two to four weeks, depending on the type and amount of substrate and spawn.

Fruiting your substrate

Fruiting is the stage when the mushroom spawn (mycelium) produces mushrooms (fruiting bodies). You need to move your colonized substrate to a place with more light, fresh air, and lower temperature. The ideal light for blue oyster mushrooms is indirect sunlight or artificial light for 12 hours a day.

The ideal temperature is between 50°F and 60°F. The ideal humidity is between 90% and 95%. You need to mist your substrate daily with water to maintain the moisture level. You will see small bumps (pins) forming on the surface of the substrate, which will grow into mushrooms in a few days.

How to Harvest Blue Oyster Mushrooms?

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Harvesting blue oyster mushrooms is easy and fun. You can harvest them when they reach their desired size and shape, usually when their caps are fully opened and their gills are exposed.

You can harvest them by twisting them gently at the base or by cutting them with a sharp knife or scissors. You can harvest them in clusters or individually, depending on your preference.

You can expect to harvest blue oyster mushrooms several times from the same substrate, as long as you keep it moist and clean.

The first harvest is usually the largest, followed by smaller ones every two weeks or so. The total yield of blue oyster mushrooms depends on the quality and quantity of the substrate and spawn, as well as the environmental conditions.

How to Store Blue Oyster Mushrooms?

Storing blue oyster mushrooms properly can extend their shelf life and freshness. You can store them in the refrigerator for up to a week or in the freezer for up to six months. Here are some tips on how to store blue oyster mushrooms:

Refrigerate them

You can refrigerate blue oyster mushrooms in a paper bag or a plastic container with holes for ventilation. Do not wash them before refrigerating them, as this will make them soggy and spoil faster. Instead, wipe them gently with a damp cloth or paper towel to remove any dirt or debris. Keep them in the crisper drawer of your refrigerator and use them within a week.

Freeze them

You can freeze blue oyster mushrooms for longer storage, but this will affect their texture and flavor slightly. You can freeze them raw or cooked, depending on your preference. To freeze them raw, wash them thoroughly and pat them dry with paper towels. Cut them into smaller pieces if you want and spread them on a baking sheet in a single layer.

Freeze them until they are firm, then transfer them to freezer bags or containers. Label them with the date and use them within six months. To freeze them cooked, sauté them lightly in oil or butter until they are tender, then let them cool completely. Transfer them to freezer bags or containers with some of their cooking liquid. Label them with the date and use them within six months.

How to Cook Blue Oyster Mushrooms?

Cooking blue oyster mushrooms is easy and versatile. You can cook them in various ways, such as sautéing, roasting, frying, grilling, baking, or stewing. You can also add them to soups, salads, stir-fries, casseroles, pies, quiches, pizzas, sandwiches, burgers, or pasta dishes. You can season them with salt, pepper, garlic, onion, herbs, spices, soy sauce, vinegar, lemon juice, wine, cheese, cream, butter, or oil.


Blue oyster mushrooms are a wonderful addition to any kitchen and garden. They are easy to grow, store, and cook, and they offer many health benefits. They are also versatile and delicious, and they can be used in various dishes and cuisines. Whether you want to enjoy them fresh, dried, frozen, pickled, or canned, blue oyster mushrooms will always satisfy your taste buds and nourish your body. Try some of the recipes we suggested or experiment with your own creations. You will be amazed by the flavor and texture of blue oyster mushrooms.

FAQs Frequently Asked Question

How do I know if blue oyster mushrooms are fresh and safe to eat?

To check the freshness and safety of blue oyster mushrooms, look for a firm and moist texture, a pleasant smell, and a vibrant color. Avoid any mushrooms that have mold, decay, or insect damage.

How do I rehydrate dried blue oyster mushrooms?

To rehydrate dried blue oyster mushrooms, soak them in warm water for 15 to 20 minutes or boil them for 5 to 10 minutes. You can use the water for broth or sauce later.

How do I make blue oyster mushroom spawn at home?

To make blue oyster mushroom spawn at home, inoculate sterilized grains with mushroom mycelium and keep them in a dark and warm place until they are colonized.

How do I make blue oyster mushroom compost at home?

To make blue oyster mushroom compost at home, mix spent mushroom substrate with other organic materials and turn and moisten the compost pile regularly until it is ready to use.

How do I preserve blue oyster mushrooms for long-term storage?

To preserve blue oyster mushrooms for long-term storage, you can dry, freeze, pickle, or can them using different methods and ingredients.

What are some of the best recipes that use blue oyster mushrooms?

Some of the best recipes that use blue oyster mushrooms are blue oyster mushroom soup, blue oyster mushroom risotto, blue oyster mushroom stir-fry, and blue oyster mushroom burger.

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Yaseen Zaman

Yaseen Zaman

Fruits, Vegetables, and Herbs Expert

With 7 years of experience in horticulture, Yaseen Zaman is your go-to expert for all things fruits, vegetables, and herbs. Yaseen's passion for sustainable and eco-friendly gardening practices, combined with his deep knowledge of horticulture, has made him a trusted resource for gardeners and farmers alike. Explore his expertise and elevate your horticultural journey with Yaseen as your guide.

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