
Mushroom compost is a by-product of mushroom farming. It is made from organic materials such as hay, straw, corn cobs, and poultry or horse manure. Mushroom compost is alkaline and can be used to neutralise acidic soils. The pH level of mushroom compost is typically around 6.6, which is slightly below the neutral level of 7 but still suitable for most plants. However, it should be avoided for acid-loving plants such as blueberries, azaleas, and rhododendrons. Mushroom compost is an excellent soil conditioner and fertiliser, improving water retention and soil structure while supplying essential nutrients for healthy plant growth.
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What You'll Learn

Mushroom compost is alkaline, with a pH of 6.6
The alkaline nature of mushroom compost makes it perfect for use on acid soils that are composed of low organic matter. Heavy clay soils benefit from the alkalinity of mushroom compost, and it adds humus to thin sandy soils. Bought in bulk, mushroom compost is a fantastic soil conditioner and is great for use in mulch. It is ideal for use in vegetable and ornamental gardens, as vegetables thrive in non-acidic soil.
Mushroom compost is a type of organic plant fertiliser. It is made by mushroom growers using organic materials such as hay, straw, corn cobs and hulls, and poultry or horse manure. Since the mushroom growing process varies slightly between individual growers, mushroom compost recipes may differ. For instance, additional materials like gypsum, peat moss, lime, soybean meal, and various other organic items may be added to the compost as well.
The pH level of your compost will determine the growth of your plants. It is important to measure the pH level of your compost in different areas, as it will probably vary. The mushroom compost will be in different phases of decomposition, so the numbers will be different.
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It's an excellent natural fertilizer for acid soils
Mushroom compost is a by-product of mushroom farming. It is made from a mixture of agricultural materials, such as straw, hay, corn cobs, cottonseed hulls, and poultry litter. This concoction is then pasteurised to kill any weeds, pests, or pathogens. The resulting compost is used to grow mushrooms, and after the harvest, it can be used to fertilise your garden.
Mushroom compost is a great natural fertiliser for your garden as it is alkaline and can help neutralise acidic soils. The pH level of mushroom compost is typically around 6.6, which is slightly below neutral on the pH scale but is still an excellent level for most plants. The alkalinity of mushroom compost makes it ideal for use in vegetable gardens as vegetables thrive in non-acidic soil. It is also a fantastic soil conditioner and can be used in mulch.
The high organic matter content of mushroom compost makes it perfect for use on acid soils that are composed of low organic matter. Heavy clay soils, in particular, benefit from the alkaline nature of mushroom compost as it adds humus to thin sandy soils. The organic matter and moisture content of mushroom compost are ideal for handling and making surface applications or incorporating into the soil.
However, it is important to note that mushroom compost is not suitable for all plants. It is best to avoid using mushroom compost with ericaceous or acid-loving plants as they prefer acidic conditions. Plants that should be avoided include azaleas, rhododendrons, camellias, and blueberries. Additionally, due to the high salt content of mushroom compost, it should not be used on young plants or seeds as it can be too harsh and kill them.
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It's not suitable for acid-loving plants like blueberries and azaleas
Mushroom compost is alkaline due to its high chalk and lime content. It is an excellent natural fertilizer for acid soils that have low organic matter. It helps to neutralise the level of acid soils, which is why it is a great solution for your garden. However, it is not suitable for acid-loving plants like blueberries and azaleas.
The pH level of your compost will determine the growth of your plants. The pH is a measure of the acidity or alkalinity expressed in a scale from one to fourteen. High values are alkaline, whereas low values are acidic. The neutral pH level is seven, and plants will grow well in neutral pH level soils. However, acid-loving plants will not survive in mushroom compost due to its alkalinity levels.
The average pH of mushroom compost is 6.6, which is below the neutral level on the pH scale but is still excellent for most plants. They will obtain nutrients from the soil easily. However, some plants, like blueberries and azaleas, prefer compost with an acidic pH level. These plants will not thrive in mushroom compost.
Mushroom compost is made from agricultural materials such as straw from horse stables, hay, poultry litter, ground corn cobs, cottonseed hulls, cocoa shells, peat moss, and other natural organic substances. The concoction is mixed and then allowed to sit for about 30 days to heat up and begin the composting process. After the mushrooms are harvested, the leftover compost is disposed of and sold as fertiliser. While it is a fantastic soil conditioner and fertiliser, it is not suitable for acid-loving plants like blueberries and azaleas.
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Mushroom compost improves water retention and soil structure
Mushroom compost is a by-product of mushroom farming. It is made from a mixture of agricultural materials, such as straw, hay, corn cobs, cottonseed hulls, and poultry litter. This concoction is then allowed to sit for about 30 days to heat up and begin the composting process. After the mushrooms are harvested, the remaining compost is removed and processed into a consistent product.
Mushroom compost is a great soil conditioner and can be used to amend clay soils, reduce surface crusting and compaction, and improve soil structure. It has a high organic matter content, typically around 25%, and an average pH of 6.6, which is slightly below the neutral level of 7. This makes it ideal for use on acid soils with low organic matter, as the compost will help to neutralise the acid levels and improve the structure of the soil.
The high organic matter content of mushroom compost also means that it has excellent water retention properties. It can absorb water, helping to prevent water pooling and improving the water-holding capacity of the soil. This, in turn, reduces the need for frequent watering. Mushroom compost also contains an average of 1.12% nitrogen, which is available slowly to plants, as well as other nutrients such as phosphate and potash.
To use mushroom compost effectively, it should be mixed with the soil rather than simply spread on top. It is recommended to apply a layer of 1-3 inches of compost and dig it into the soil to a depth of 6 inches. This will allow the soil to obtain the nutrients from the mushrooms and improve its quality. However, it is important to use mushroom compost in moderation, as it has high salt and alkaline levels, which can be harmful to some plants.
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It's a slow-release, organic plant fertilizer
Mushroom compost is a slow-release, organic plant fertiliser. It is made from the remaining harvest of mushrooms and is an excellent natural conditioner for dry soil. Mushrooms add multiple nutrients and moisture to soils. The recipe for mushroom compost varies depending on the company, but it typically includes organic materials such as hay, straw, corn cobs, poultry or horse manure, and other natural substances.
Mushroom compost is a great option for those looking to improve the quality of their soil. It is especially beneficial for acid soils with low organic matter, as it has a neutralising effect. The pH level of mushroom compost is typically around 6.6, which is slightly below the neutral level of 7 but still within an ideal range for most plants. Its ability to absorb water can help prevent water pooling, which can lead to issues such as root rot.
It is important to note that mushroom compost should be used in moderation, as it contains high levels of salt and soluble salts, which can be harmful to some plants. It is also not suitable for acid-loving plants, as it has a high alkaline content due to the presence of chalk or lime. Before using mushroom compost, it is recommended to test the pH level of your soil to ensure it is suitable.
Mushroom compost can be purchased from garden supply centres or directly from mushroom growers. It is often sold in bulk and is a reasonably inexpensive option for fertilising your garden. When applying mushroom compost, it is best to mix it with the soil rather than simply placing it on top. Experts recommend applying a 3-inch layer of mushroom compost and digging 6 inches into the soil for optimal results.
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Frequently asked questions
No, mushroom compost is alkaline. Its pH level is around 6.6, which is slightly below neutral.
Mushroom compost is a by-product of mushroom farming. It is made from organic materials such as straw, hay, corn cobs, poultry or horse manure, and other natural substances.
Mushroom compost is an excellent natural fertilizer for acid soils with low organic matter. It helps to neutralize acid soils and improve soil structure. It also increases the water-holding capacity of the soil, reducing the need for watering.
Most plants will benefit from mushroom compost due to its excellent nutrient availability. It is especially good for alkaline-loving plants like brassicas (broccoli, kale, Brussels sprouts, cabbage) and vegetables.
Avoid using mushroom compost for acid-loving plants such as azaleas, rhododendrons, camellias, blueberries. It is also not suitable for most fruit produce and should be used with caution for young plants due to its high salt content.
























