Unlock the potential of calcareous soils with the Heritage Calcareous Soils 100% Wildflower Seed Mix from John Chambers Wildflower Seed. Specifically designed for alkaline, chalky, and limestone-rich soils, this premium mix is 100% wildflower seed with no grasses, offering a diverse and vibrant range of UK native species that thrive in mineral-rich, well-drained environments.
Perfect for a variety of locations such as chalk meadows, limestone quarries, calcareous heathland, or dry, rocky outcrops, this mix encourages biodiversity and helps restore native flora in areas where soils are low in nutrients and naturally alkaline. Featuring hardy, drought-tolerant species like Black Medick, Rough Hawkbit, Wild Carrot, and Lady's Bedstraw, the mix is designed to establish quickly and create beautiful, long-lasting wildflower meadows.
Ideal for landowners, councils, conservationists, landscapers, and farmers, the Heritage Calcareous Soils Mix enhances local wildlife habitats, supports pollinators, and contributes to long-term ecological sustainability in calcareous and chalky soil environments.
All wildflower seed mixes are subject to change depending on seasonal harvest and availability. Additional species may be included to ensure optimal performance in calcareous soil conditions.
Features & Benefits
100% UK Native Wildflowers – Pure wildflower mix, no grass seed
Optimised for Alkaline Soils – Perfect for chalk, limestone, and calcareous sites
Drought-Tolerant Species – Excellent for dry conditions, minimal watering required
Biodiversity-Boosting – Supports pollinators and enhances local ecosystems
Heritage Range Quality – Trusted by landowners and professional landscapers
Applications
Calcareous meadows and chalky grasslands
Limestone-rich soils and rocky outcrops
Agricultural land restoration and set-aside areas
Road verges, embankments, and field margins
Nature reserves, wildlife corridors, and ecological restoration projects
Main Species in the Mix
Black Medick (Medicago lupulina)
Rough Hawkbit (Leontodon hispidus)
Wild Carrot (Daucus carota)
Lady’s Bedstraw (Galium verum)
Small Scabious (Scabiosa columbaria)
Wild Basil (Clinopodium vulgare)
Actual seed species may vary depending on the time of year and availability, with additional native species potentially included to enhance the mix.
Sowing Information
Sowing Time:
Spring (March to May)
Autumn (August to October) – ideal for winter stratification and spring emergence
Sowing Rate:
100% Wildflower Mix – 2g to 4g per m²
Large areas: 30–50kg per hectare
How to Sow:
Prepare the Soil – Ensure a clean, well-drained seedbed by removing existing vegetation and debris.
Rake the Soil – To create a fine tilth that allows seeds to make good contact.
Broadcast the Seed – Evenly across the surface, optionally mixing with sand for easier spreading.
Firm the Soil – Lightly roll or press the surface to secure the seed.
Water if Dry – Particularly important during spring sowings.
About John Chambers Wildflower Seed
John Chambers Wildflower Seed has been a trusted name in the wildflower industry for over 40 years, offering high-quality, UK native wildflower seed mixes. The Heritage Range is specially crafted for diverse soil types, from calcareous to acidic, ensuring the right species thrive in their ideal environments.

Attribute Details
Seed Mix Type 100% Wildflower Seed – No grass
Flowering Window Late spring to autumn (varies by species)
Soil Suitability Alkaline, chalky, and limestone-rich soils
Sowing Times Spring (Mar–May) or Autumn (Aug–Oct)
Sowing Rate 2g-4g per m² (30–50kg per hectare)
Main Species Black Medick, Wild Carrot, Lady’s Bedstraw, etc.
Minimum Order 10g+
Provenance Native UK species – subject to seasonal variation
Brand John Chambers Wildflower Seed – Heritage Range