Mushroom Compost - 40L

We're happy to supply whichever quantities you need. Simply fill in the form here and our team will get in touch with you to discuss your needs.

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Our Compost handy bags are roughly 40L, but exact measurements may vary depending on density and conditions.

Mushroom Compost is a nutrient-rich soil improver produced as a byproduct of commercial mushroom cultivation. This well-decomposed compost is high in organic matter, beneficial fungi, and trace minerals, helping to improve soil biology and overall fertility.

With a slightly alkaline pH, mushroom compost is particularly effective for improving acidic soils, while its crumbly texture enhances soil structure, aeration and moisture retention.

Supplied in convenient 40L bags, it’s ideal for borders, raised beds and general garden use. For larger projects, you may want to consider our Mushroom Compost Bulk Bag option.

• Soil Structure – Loosens soil, improves drainage, and retains moisture.
• Sustainable Fertiliser Alternative – Reduces chemical fertilizer use.
• Environmentally Friendly – Recycled mushroom farm byproduct.
• Nutrient Rich – Contains nitrogen, phosphorus, and potassium.
• Promotes Plant Growth – Supports roots, foliage, and blooms.
• Supports Microbial Activity – Boosts beneficial soil microbes.
• Versatile Use – Suitable for gardens, lawns, and containers.
• Reduces Soil Compaction – Lightens soil for root growth.
• Enhances Water Retention – Helps soil hold moisture.
• pH Balancing – Helps neutralise acidic soils.

• Flower Beds & Borders
• Vegetable & Herb Gardens
• Lawns & Turf
• Soil Improvement
• Potting

Pennys are proud to offer FREE 3-5 Working Day Delivery nationwide on all of our products. As these are shipped on palettes, we kindly ask you to order in multiples of 5 for delivery. We are happy to offer single bags of any quantities for free collection from our Ston Easton site. Please shop our collection bags here:

> Single Bags for Collection

If you need specific quantities on a larger order, please do not hesitate to contact the team or fill in a quote form, and we will do our best to accommodate this.

> Full Shipping Policy

First please measure the length and width of your area in metres to get your m2 measurement:

Length (m) x Width (m) = m2

For topsoil, please then multiply this by the depth required and by 1.2 to calculate how much you need:

m2 x Depth (m) x 1.2 = tonnes required

For compost:

m2 x Depth (m) x 0.6 = m3

Multiply your m3 measurement by 1000 to give litres of compost required.

*IMPORTANT* Please note that these are rough measurements, and the density of our products can vary due to environmental factors. If you are unsure, please fill in the quote form or give us a call on 01761 241387 so one of our team can help you make more accurate calculations.

> Get a Quote

Product Disclaimer & Natural Variations

All soils and compost products undergo rigorous testing to ensure compliance with chemical, physical, and nutrient quality standards. While we take immense pride in the quality of our premium topsoil and compost, please note the following characteristics of these natural, recycled products:

• Screening & Debris: Our products undergo a rigorous screening process to remove stones and contaminants. However, as a recycled organic material, we cannot guarantee the total absence of tiny debris or naturally occurring weed seeds.
• Natural Variation: Topsoil and compost are natural products; therefore, variations in colour, texture, and moisture content are expected and may vary from the product images shown or between different batches.
• Sourcing: We prioritise local, high-quality green waste and topsoil sourced from greenfield sites only. Because the raw ingredients change seasonally, the exact nutrient profile may fluctuate slightly.
• Storage: Once delivered, we recommend keeping the product covered if not used immediately to prevent the contamination of airborne seeds or saturation from heavy rain.
• Usage: It is the customer's responsibility to ensure the specific grade of topsoil or compost ordered is suitable for their intended planting or landscaping project.