Specially developed for chalk and limestone-rich ground, the Pro Calcareous Soils 80% Grass Mix Wildflower Seed is part of our Professional Range, designed for use by contractors, councils, landscape architects, and land managers. This tailored wildflower seed mix is enriched with native UK species proven to thrive on calcareous soils, ensuring a reliable and florally diverse display over time.
The blend includes an 80% low-maintenance grass seed base to aid establishment and soil stabilisation, supporting the 20% mix of vibrant wildflowers. Calcareous soils often present challenges due to high alkalinity, but this mix has been carefully formulated to favour species with proven success in such conditions—ideal for long-term biodiversity gains and pollinator support.
Main species in the mix include: Selfheal, Dropwort, Common Vetch, Wild Carrot, Bird’s-foot-trefoil, and Common Poppy. The full mix may contain even more native species, all selected for their compatibility with free-draining, alkaline environments.
This seed mixture is ideal for creating wildlife-rich habitats and enhancing landscapes such as open parklands, roadside verges, public green spaces, field margins, farm edges, chalk grasslands, and rural developments.
All wildflower seed mixes are subject to change depending on harvest, availability, and seasonal variations. Additional suitable species may be included.
Features & Benefits
80/20 mix: 80% grass seed, 20% wildflower seed
Formulated for chalk and limestone soils
Encourages pollinators and native insect life
Great for low-nutrient or alkaline soil restoration
Easy to establish and maintain with minimal mowing
Applications
Chalk grassland and calcareous landscapes
Wildlife corridors, verges and embankments
Farm margins and countryside stewardship schemes
Parks, community green spaces, and amenity grasslands
Restoration and conservation projects
Sowing Rate & Guidance
Sowing rate: 4g per m²
Sowing time: March–May or August–October
Seedbed preparation: Clear weeds and rake soil to a fine tilth
How to sow: Broadcast seed evenly by hand or seed spreader, roll or lightly tread to ensure contact
Water in dry conditions, and avoid cutting during flowering season
About the Pro Range – John Chambers Wildflower Seed
The Pro Range is developed by John Chambers Wildflower Seed, a leading name in UK habitat restoration. With over 40 years’ experience, our Pro mixes are tailored for landscape professionals, offering enhanced practicality and performance. These mixes include more frequently observed native species for successful, resilient planting schemes.
John Chambers is committed to preserving Britain’s natural flora and is a proud supplier to conservation schemes, local authorities, and ecological contractors across the UK.

Mix ratio: 80% low maintenance grass, 20% native wildflowers
Sowing rate: 4g/m²
Sowing seasons: Spring (Mar–May) or Autumn (Aug–Oct)
Minimum order: 100g
Brand: John Chambers Wildflower Seed – Pro Range
Origin: UK native species mix