Mushroom Compost

£65.00 exc VAT

Searching for the perfect compost to improve soil quality and promote plant growth? Look no further than Alsoils’ 0.75m³ bulk bag of Mushroom Compost! Our spent mushroom compost is a blend of composted straw, well rotted manure and lime that has previously been used to grow mushrooms.

Mushroom compost is a great option for those looking for an environmentally-friendly, sustainable way to improve soil structure and health – utilising the mushroom growing industry for bulk bags of spent mushroom compost can help lower your carbon footprint.



Our spent mushroom compost is a quality, economical soil conditioner that improves the structure of heavy clay soils which in turn helps drainage and adds humus, nutrients to thin sandy soils. This compost that has ingredients from a local mushroom farm, is the perfect addition to any garden or agricultural operation looking to improve soil quality and promote healthy plant growth.

All of our bulk bags are filled to the brim, so you can be sure that you get the best value for money and a good-quality product.

Details: pH Level: 6.5 -7, Organic Matter: 66%, Ammonia: 0.26%, Magnesium: 0.4%, Nitrate: 0.08%, Phosphorus: 0.6% and Potassium: 3.1%

Suitable for:Mulching, soil conditioning, vegetable growing, tree and shrub planting

Bag size: 0.75m³

Available in: Portsmouth, Southampton, Winchester, Chichester, Waterlooville and other towns and villages within Hampshire and West Sussex


Mushroom Compost FAQs

Is mushroom compost better than regular compost?

Spent mushroom compost is high in organic matter content which makes it a useful material for soil improvement and mulching – it can be better than regular compost for these.

What can I use mushroom compost for?

This type of compost is great for improving soil structure and water retention, as well general mulching.

Can you use too much mushroom compost?

Regular or heavy use of mushroom compost usually leads to a build-up of chalk particles in the garden soil and to increased soil alkalinity, which can negatively affect plants.

Where not to use mushroom compost?

We recommend not using mushroom compost in areas where you’re growing ericaceous plants like rhododendrons, camellias, azaleas and heathers. These plants thrive in acidic conditions and are sensitive to alkaline soil.

Applying mushroom compost to these plants might disturb the pH balance which is crucial for the well-being of plants that thrive in acidic environments.

Does mushroom compost suppress weeds?

Mushroom compost suppresses weeds as a mulch or soil amendment by forming a barrier against weed growth, blocking sunlight and hindering seed germination. Its nutrient content promotes plant growth that can outcompete weeds, improving weed control.

Can I use mushroom compost instead of soil?

Mushroom compost is a fantastic soil amendment that offers numerous benefits for plant growth, but using it as a complete replacement for soil is generally not recommended. Mushroom compost is rich in nutrients and organic matter, making it an excellent choice for improving soil fertility, enhancing water retention, and promoting healthy plant development.

Mixing mushroom compost with existing soil creates an optimal environment that benefits both components. This ensures your plants get the essential nutrients, moisture, and improved structure needed for healthy growth.

Is mushroom compost suitable for all types of plants?

Mushroom compost is suitable for various plants such as vegetables, annuals, perennials, roses and shrubs by enhancing soil fertility and plant health due to its nutrient-rich content and soil improvement qualities.

However, it’s not suitable for ericaceous plants like rhododendrons, camellias, azaleas, and heathers that prefer acidic conditions.

Can I use mushroom compost as a fertiliser?

Mushroom compost can be used as a slow-release fertiliser. Similar to other compost types, it gradually releases a variety of nutrients to plant roots as it breaks down. This characteristic makes it an effective choice for enriching the soil and enhancing overall plant/grass health by providing a steady and consistent nutrient supply over time.

Mushroom Compost Volume Calculator

Delivery Information

Our Mushroom Compost bulk bag deliveries are typically made via a vehicle with a crane offload.

Deliveries will be between 2/5 working days from ordering – unfortunately we are unable to specify a specific time although if you call us, we can usually let you know what day and a rough time to expect your delivery, however due to the nature of our business this cannot be guaranteed and can change at short notice.

Being a local, family-run business we only have the capabilities to deliver topsoil, manure, mulch and other products to areas near our HQ in Hambledon, Hampshire (see our delivery zones page for more information). Please note, we are currently unable to deliver bulk bags of Mushroom Compost Topsoil within the Portsmouth Clean Air Zone.


Based on 14 reviews
Mark Belshaw
Mark Belshaw
Ordered 2 bulk bags of manure on Wednesday, late afternoon and all was delivered by Friday lunch time. Great quality product and excellent delivery turnaround.
Charles Smith
Charles Smith
Excellent, from order to delivery. 10 tonnes of loose load top soil delivered within a few days. Best price and the 10mm screened soil is great quality. Thank you
Lesley Barry
Lesley Barry
Excellent product ordered 4 bags of top soil the driver was so accommodating as we have a very long driveway. The customer sevice was excellent. Thank you.
David Robberts
David Robberts
Excellent product at a sensible price from a local supplier. Staff are friendly and willing to help: I asked if just one bag of topsoil could be delivered quickly and it arrived next day! Great service.
Mark Hibberd
Mark Hibberd
Smooth execution of the transaction and delivery. Very helpful phone call and conversation. Ordered three bags of Border Blend topsoil. Paid by Paypal. They delivered, on the specified date, carefully, exactly where I wanted the bags placed. All in all, a very pleasing purchase. The topsoil was excellent and had been very carefully prepared. No lumps. Would definitely recommend and I will use again. Everyone I spoke to was nice and helpful.
David Stamp
David Stamp
Ordered topsoil on Tuesday came by Friday at the exact time quoted. Was WAY cheaper than anywhere else (by about £15 per bag) and was dropped off via a crane on back of the lorry, not by pallet which most of the other places use. Soil was fine and dry. Brilliant !