Bring colour, biodiversity, and natural beauty to heavy clay soils with the Heritage Clay Soils 100% Wildflower Seed Mix from John Chambers Wildflower Seed. Specially developed for areas with high clay content and poor drainage, this premium seed mix contains only 100% native UK wildflowers—no grass seed included—making it ideal for true wildflower meadows and conservation-led landscapes.
Clay soil areas are often challenging to plant, but this mix features a carefully selected blend of species that are proven to establish and thrive in heavier ground. Designed as part of the Heritage Range, this mix is a favourite among landscape professionals, councils, environmental organisations, and landowners looking to bring underused or difficult sites into ecological productivity.
Typical areas of use include parklands, road verges, school grounds, farmland buffer strips, field margins, hedgerows, open green spaces, and gardens. The wildflowers support vital pollinator habitats, contribute to biodiversity net gain schemes, and deliver long-lasting seasonal colour from spring into late summer.
Species included in this wildflower seed mix are specially chosen for clay soils and include Meadow Cranesbill, Ribwort Plantain, Greater Knapweed, Lady’s Bedstraw, Selfheal, and Oxeye Daisy—with many more native species included to support succession flowering and pollinator interest.
Please note: all seed mixes are subject to change depending on time of year and seed availability. Our mixes may include more species than listed, all selected for their suitability to clay soils and UK origin.
Features & Benefits
100% UK Native Wildflowers – No grass seed, full visual and ecological impact
Perfect for Clay Soils – Designed to establish in heavier, moisture-retentive ground
Supports Pollinators & Biodiversity – Attracts bees, butterflies, and beneficial insects
Ideal for Habitat Creation – Suitable for councils, landscapers, farmers, and gardeners
Premium Heritage Range Quality – Trusted seed for ecological and landscape projects
Applications
Road verges and embankments
Public parks, schools, and green infrastructure
Farmland buffer zones and set-aside land
Hedgerows, field boundaries, and countryside stewardship
Open space regeneration and brownfield restoration
Gardens and clay-rich backyards
Main Species in the Mix
Meadow Cranesbill (Geranium pratense)
Ribwort Plantain (Plantago lanceolata)
Greater Knapweed (Centaurea scabiosa)
Lady’s Bedstraw (Galium verum)
Selfheal (Prunella vulgaris)
Oxeye Daisy (Leucanthemum vulgare)
Additional wildflower species may be included depending on seed availability and seasonal harvest.
Sowing Information
Sowing Time:
Spring (March to May)
Autumn (August to October) – ideal for natural seed stratification
Sowing Rate:
100% Wildflower Mix – 2g to 4g per m²
Larger sites: 30–50kg per hectare
How to Sow:
Clear the Area – Remove existing vegetation and lightly cultivate the soil.
Prepare a Fine Tilth – Create a level, crumbly seedbed.
Broadcast Seed Evenly – Mix with sand if needed for better distribution.
Firm Down the Surface – Lightly roll or tread to ensure seed-to-soil contact.
Water Gently if Dry – Helps with early germination, especially in spring sowing.
About John Chambers Wildflower Seed
For over 40 years, John Chambers Wildflower Seed has supplied high-quality native seed to the UK landscape and environmental sector. The Heritage Range offers 100% wildflower seed mixes that are carefully formulated using UK-provenance species. Whether for conservation, landscape architecture, or rewilding projects, our mixes are chosen by professionals who want to get it right, first time.

Attribute Details
Seed Mix Type 100% Wildflower Seed – No grass
Soil Suitability Clay and compacted soils
Sowing Times Spring (March–May) or Autumn (Aug–Oct)
Sowing Rate 2g–4g per m² (30–50kg per hectare)
Main Species Meadow Cranesbill, Greater Knapweed, Oxeye Daisy, etc.
Typical Flowering Spring to late summer
Minimum Order 10g+
Provenance Native UK Species – Subject to seasonal variation
Brand John Chambers Wildflower Seed – Heritage Range