Biochar Super Compost (SF60, Soil Improver)
SoilFixer SF60 is a premium biochar-based super compost designed to dramatically improve soil health. It contains around 20% activated biochar blended with fine wood and composted manure, making it rich in nutrients and organic matter. SF60 boosts microbial activity, improves water retention, and supports beneficial fungi like mycorrhizae. Ideal for new beds, containers, or improving tired soil, simply mix into the root zone at 15–20% by volume. Peat-free and sustainably made, it’s a powerful choice for eco-conscious gardeners.
If you need large-quantity loose loads (e.g. 10–20 tonnes), please contact us.
Biochar Super Compost (The Best Soil Improver, Enriched Biochar)
Jumpstart microbial life and turbocharge root health with our ready-to-use targeted compost, specially formulated to boost beneficial microbes and mycorrhizal fungi.
Just mix in 15%–20% with your soil and hoe it into the root zone for optimum results.
SF60 Biochar Super Compost
- Ready to go! Just mix into soil or containers for thriving plants and flavour-packed veggies
- 100% Organic (carbon-based), Peat-Free – made entirely from sustainable material
- Proudly Made in Surrey using our unique, farm-based composting process
- Our Unique Blend – approx. 20% biochar, 70% composted manure, 10% fine wood compost
- Boosts Soil Health – improves water retention and delivers nutrients right to the roots
- Climate-Friendly – stores carbon in your soil to help fight climate change
What Is It Used For and How?
Incorporating into Soil
- New Beds & Containers: Blend compost into the root zone before planting to give roots the best start.
- Established Beds: Gently loosen soil and work the compost in to a depth of 6–8 inches.
- How Much to Use: Aim for a 15–20% mix by volume for most soils.
Potting Mixes
- Blending In: Mix compost with regular potting soil to create a moisture-holding, nutrient-rich medium.
- Suggested Ratios: Use 10–15% compost, adjusting based on your plant’s appetite and soil type.
Benefits
- Boosts nutrient supply to roots – encourages beneficial fungi like mycorrhizae for better nutrient uptake
- Improves soil structure – loosens soil for better airflow and root growth
- Holds water for longer – retains moisture for days, not hours like compost
- Quick to re-wet – reabsorbs water fast after drying out
- Feeds plants steadily – contains both quick and slow-release nutrients (NPK)
- Rich in micro-nutrients – includes calcium, magnesium, and more for healthy growth
- Good for the planet – locks away carbon and helps reduce greenhouse gases (1 kg = 1.8 kg CO₂ saved)
- Supports soil life – includes woody chips to promote fungi and prevent soil compaction
Pack Sizes
- 10 kg sack (approx. 15 litres)
- 20 kg sack (approx. 30 litres)
- For larger orders, please email: help@soilfixer.co.uk
It is important to dig (or hoe) Biochar Super Compost (SF60) into the root zone.
Store SF60 in a cool, dry place. Avoid direct sun and drying out.
By improving fertility, water retention, nutrient availability, and soil structure, SF60 helps produce healthier plants, better vegetables, and stronger crops — all in a sustainable, environmentally friendly way.
Case Study by Tony Callaghan
Originally formulated by Tony Callaghan, founder of SoilFixer, SF60 has shown impressive results. In early trials documented in a 2016 blog, Tony recorded up to a 100% increase in plant and crop growth compared to untreated soil.
While plant growth testing is complex and varies by time and conditions, long-term use of SF60 — especially with regular annual applications — leads to cumulative improvements in soil health.
Most users can conservatively expect around a 20% growth boost, resulting in lusher plants and tastier vegetables.
To further enhance performance, we’ve recently added composted wood chip, which supports beneficial woody fungi and improves soil aeration — giving your plants the structure and microbial support they need to thrive.
