seed dots flat
Heavy Clay Soils Meadow Mix
Wildflower Seed Mulch Mat Rolls

What is a Seed Mat?

Find Out More

What is Improver?

The seed improver/carrier is a blend of kiln dried sand and natural cellulose bonding agent to improve spread and germination

Heavy Clay Soils 80/20 Meadow Mix

Price range: £19.50 through £2,136.00 inc VAT

An 80/20 mix for heavy clay soils — native grasses with 20% wildflowers selected to handle wet winters, summer drought, and clay’s challenging conditions.

Why Yellow Rattle? This mix already includes a little, but nowhere near the rate a dedicated top-up needs to open up an established sward. Skip this if you're sowing bare ground.

Sowing into existing grass?

This mix already contains a little Yellow Rattle. Add the top-up only if you're sowing into existing grass, not bare soil.

UK delivery £5.95 per order
Larger area or a bespoke mix? Ask us for a quote →

Full description and FAQs ↓

About this product

Establishing a wildflower meadow on heavy clay is challenging — the soil holds water in winter, bakes hard in summer, and drains slowly. The Heavy Clay 80/20 mix addresses this with fine native grasses and a 20% wildflower component both selected specifically for clay-based conditions. The grass matrix improves ground stability and helps the mix handle the extremes clay soils present.

Suitable for garden meadows, farm margins and amenity restoration on neutral to lime-rich heavy clay, particularly where previous seeding attempts have failed. Several of the wildflowers, including Salad Burnet, Greater Knapweed, Hoary Plantain and Sainfoin, prefer ground that is not acidic. If your clay tests below about pH 6, choose our Acidic Soils 80/20 mix or ask us for a bespoke blend. The mix builds insect habitat and provides seasonal colour as it establishes.

Sow at 5g per square metre into a thoroughly scarified, fine seedbed. Avoid sowing into waterlogged or compacted ground — clay must be workable before sowing. Early autumn sowing (August–September) works well, giving the mix time to stratify over winter. Expect steady establishment in year one with clear improvement from year two.

Sourced from UK meadows and partner farms. 100% British native species.

Frequently asked questions

Why do I need a specialist mix for heavy clay soil?

Heavy clay holds water in winter and bakes hard in summer — extremes that most standard wildflower mixes do not handle well. The Heavy Clay 80/20 mix uses native grasses and wildflowers both selected specifically for clay-based conditions, giving far better establishment than a general-purpose mix on this ground.

Does the grass component help on clay soil?

Yes — the 80% native grass matrix improves surface stability and structure on clay, helping the mix handle the wet-dry cycle without poaching or cracking. It also makes the meadow more resilient during the first season when clay soils can be particularly challenging for establishing wildflowers.

How should I prepare clay soil and sow this mix?

Scarify thoroughly to break up the surface and create a fine, firm seedbed. Avoid sowing into waterlogged or compacted ground. Early autumn sowing (August to September) works well on clay, allowing the mix to stratify over winter. Sow at 5g per square metre. Do not add grit or organic matter — work with the soil.

How long does it take to establish a wildflower meadow on clay?

Clay soils slow establishment compared to lighter ground. The grass matrix builds cover in year one. Wildflowers strengthen from year two, and the meadow delivers a noticeably improved display from year two onwards with correct annual management — a single late-summer cut, cuttings removed.

Wildflower Seed Mulch Mat Rolls

What is a Seed Mat?