Can You Compost Mushrooms? (Raw or Cooked)

  • By: Sam Richards
  • Date: July 17, 2023
  • Time to read: 7 min.

Composting has gained popularity as an environmentally friendly method of waste disposal and soil enrichment. As composting enthusiasts explore the range of materials that can be composted, questions often arise about the compostability of mushrooms. Mushrooms, with their unique characteristics and growth patterns, present a fascinating topic of discussion in the composting world. In this article, we will delve into the world of mushrooms, examine whether they can be composted effectively, and highlight the numerous benefits that come with composting mushrooms. Furthermore, we will provide comprehensive guidance on the proper techniques for composting mushrooms and explore the various applications of mushroom compost in your garden.

Why You Need Compost Mushrooms

Mushrooms are captivating organisms that belong to the fungal kingdom. Unlike plants, mushrooms lack chlorophyll and cannot produce their own food through photosynthesis. Instead, they obtain nutrients by breaking down organic matter in their surroundings. The visible part of a mushroom, known as the fruiting body, is what we commonly recognize as the mushroom itself.

Mushrooms are the result of the reproductive process of fungi. Below the surface, a vast network of thread-like structures called mycelium spreads, forming an intricate web within the soil, wood, or other substrates they inhabit. This mycelium serves as the mushroom’s main body and functions as its feeding and nutrient-absorbing system.

Composed primarily of chitin, cellulose, lignin, and other complex organic compounds, mushrooms have unique nutritional compositions. They also possess a high water content, which contributes to their delicate texture and susceptibility to decay.

Mushrooms play a crucial role in nature’s ecosystem by breaking down organic matter and recycling nutrients back into the environment. Their mycelium acts as nature’s decomposers, breaking down dead plant material, logs, and other organic debris, transforming them into valuable nutrients that can be utilized by other living organisms.

Furthermore, mushrooms have fascinated humans for centuries. They are not only valued for their culinary uses but also appreciated for their medicinal properties and ecological significance. Understanding the nature and characteristics of mushrooms is essential when considering their compostability and the potential benefits they can bring to your composting practices.

Can You Compost Mushrooms?

Yes, mushrooms can be composted. However, there are a few considerations to keep in mind. Mushrooms are often grown in controlled environments, and some varieties may contain pesticides, fungicides, or other chemicals. It is crucial to ensure that the mushrooms you are composting are organic and free from any harmful substances. Additionally, mushrooms may release spores during decomposition, which can potentially result in new mushroom growth in your compost pile or garden. While this may not be desirable for everyone, these spores are generally harmless and can be beneficial to your garden’s ecosystem.

Benefits of Composting Mushrooms

Composting mushrooms offers a range of benefits that go beyond waste reduction. Here are some key advantages of including mushrooms in your composting practices:

  1. Waste Reduction: By composting mushrooms, you divert them from ending up in landfills where they contribute to methane emissions, a potent greenhouse gas. Instead, you transform them into nutrient-rich soil amendments.
  2. Nutrient Contribution: Mushrooms contain valuable nutrients that can enhance the quality of your compost. As they break down, they release nitrogen, phosphorus, potassium, and other essential elements into the compost pile. These nutrients are vital for promoting healthy plant growth and development.
  3. Soil Enrichment: When you incorporate composted mushrooms into the soil, you improve its structure and fertility. The organic matter in mushroom compost helps retain moisture, enhances aeration, and promotes beneficial microbial activity in the soil. This, in turn, creates a favorable environment for plants to thrive.
  4. pH Balancing: Depending on the types of materials used in your compost pile, the pH level may become too acidic or alkaline. Mushrooms, with their pH-balancing properties, can help regulate the pH of your compost, ensuring optimal conditions for decomposition.
  5. Sustainable Gardening: Composting mushrooms aligns with sustainable gardening practices. It allows you to recycle organic waste, reduce the need for chemical fertilizers, and promote a more environmentally friendly approach to cultivating plants.
  6. Cost Savings: By composting mushrooms, you can reduce your reliance on store-bought fertilizers and soil amendments. Instead, you can produce nutrient-rich compost at home, saving money in the long run.
  7. Ecosystem Support: Composting mushrooms supports a healthy and diverse ecosystem in your garden. It promotes the growth of beneficial microorganisms, earthworms, and other soil organisms that contribute to soil health and vitality.

It’s important to note that the benefits of composting mushrooms can vary depending on the specific mushroom species, the quality of the composting process, and the overall management of the compost pile. Nonetheless, incorporating mushrooms into your composting routine can lead to more sustainable gardening practices and contribute to the overall health and productivity of your garden.

How to Compost Mushrooms

Composting mushrooms follows the same basic principles as composting other organic materials. Here’s a step-by-step guide to composting mushrooms effectively:

  1. Ensure your mushrooms are organic and free from harmful chemicals.
  2. Chop or break up the mushrooms into smaller pieces. This will speed up the decomposition process.
  3. Mix the mushrooms with other compostable materials, such as vegetable scraps, leaves, and yard trimmings. Aim for a balanced ratio of greens (high-nitrogen materials) and browns (high-carbon materials).
  4. Add moisture to the compost pile if necessary. Mushrooms have high water content, but additional moisture may be required if the compost pile is too dry.
  5. Turn the compost pile regularly to aerate it and facilitate decomposition.
  6. Monitor the temperature and moisture levels of the compost pile. Ideally, the temperature should reach 120-160°F (49-71°C) for efficient decomposition.
  7. Composting mushrooms may take several weeks to several months, depending on various factors such as temperature, moisture, and the size of the mushroom pieces.
  8. Once the compost is dark, crumbly, and earthy-smelling, it is ready to be used in your garden.

Special Section: Using Mushroom Compost in Your Garden

Mushroom compost, also known as spent mushroom substrate, is the material left over after the mushrooms have been harvested. It is an excellent addition to your garden soil due to its high nutrient content. Mushroom compost improves soil structure, enhances water retention, and provides a slow-release source of nutrients for plants.

To use mushroom compost in your garden:

Spread a layer of mushroom compost on your garden beds or mix it into the existing soil.

Incorporate the compost into the top few inches of soil.

Avoid using pure mushroom compost as it can be too rich and may burn your plants. Mix it with existing soil or other compost materials for a balanced blend.

Water the composted area thoroughly to ensure proper moisture distribution.

Plant your desired vegetables, flowers, or other plants in the prepared soil.


Can I compost cooked mushrooms?

Yes, cooked mushrooms can be composted. However, avoid composting mushrooms that have been cooked with a lot of oil or seasoning, as this can attract pests.

 Can I classify mushrooms as “brown” or “green” when composting?

The mushroom fruiting bodies themselves, with their high water content, tend to have characteristics of “greens.” However, the mycelium and the substrate on which mushrooms grow often consist of carbon-rich materials like wood and straw, resembling “browns.”
In practical terms, you can consider mushrooms as a combination of both “browns” and “greens” when determining the balance in your compost pile. It’s beneficial to mix mushrooms with a variety of other compostable materials, ensuring a well-balanced ratio of carbon to nitrogen.

Is mushroom compost safe?

Generally, mushroom compost is safe for use in the garden, but it’s always a good idea to wear gloves when handling any compost.

How long does it take for mushrooms to compost?

The composting time for mushrooms can vary depending on the conditions of your compost pile, but typically, they should break down within a few weeks to a few months.

Can I compost store-bought mushrooms?

Yes, store-bought mushrooms can be composted as long as they are organic and free from harmful substances.

Can I compost mushroom packaging (e.g., cardboard trays)?

Yes, mushroom packaging made from cardboard or other compostable materials can be composted along with the mushrooms.

Are mushroom spores harmful?

Mushroom spores are generally harmless. While they may result in new mushroom growth in your compost pile or garden, they contribute to the natural decomposition process.


Composting mushrooms presents a valuable opportunity to engage in eco-friendly waste management and promote sustainable gardening practices. By understanding the unique characteristics of mushrooms and implementing proper composting techniques, you can unlock a range of benefits for both the environment and your garden.

Composting mushrooms reduces waste by diverting them from landfills, mitigating greenhouse gas emissions, and promoting a circular economy. The nutrient-rich composition of mushrooms enriches your compost pile, enhancing its fertility and providing essential elements for plant growth. Incorporating composted mushrooms into your garden soil improves its structure, water retention capacity, and overall health, leading to more robust and productive plants.

Moreover, composting mushrooms aligns with sustainable gardening principles by reducing reliance on synthetic fertilizers, minimizing chemical inputs, and fostering a healthy soil ecosystem. It also offers the advantage of cost savings, as you can produce nutrient-rich compost at home instead of purchasing commercial soil amendments.

By embracing the power of mushrooms in composting, you contribute to a greener and more sustainable future. You reduce waste, enhance soil fertility, and support the overall health and productivity of your garden. Whether you are a seasoned composter or just starting out, incorporating mushrooms into your composting routine can bring numerous rewards.

So, don’t hesitate to explore the world of composting mushrooms and witness the transformative impact they can have on your garden. By nurturing a healthy compost pile and harnessing the benefits of mushroom compost, you can cultivate thriving plants while contributing to a more sustainable and environmentally conscious lifestyle. Let mushrooms be your composting allies as you embark on a journey toward greener and more fruitful gardening practices.

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