Built for clay
Wet Soils & Clay Grass Seed
Grass that grows where your lawn floods in winter and the clay bakes hard in summer.
£47.00
Tax included. Free next-day UK delivery.
Green in 14–28 daysSlower on clay, but built to establish properly.
For heavy clayHandles wet winters and dry summer spells.
Tall fescue blendDeep roots, ryegrass recovery and creeping fescue density.
Need the exact amount?Use the calculator before you buy.
Green in 2–3 weeks (a little longer on heavy clay). The deep-rooting tall fescue is worth the wait.
Covered by our Growth Guarantee. It grows, or we replace it.
Free next-day deliveryOrder by noon, Mon–Fri
Hassle-free returns30-day, no quibble
In stockDispatched same day
Deep-rooting tall fescue, ryegrass & creeping red fescue · Backed by Barenbrug
What makes this different
The grass that handles what others can’t
Most lawn seed sulks on heavy clay and drowns in a wet winter. This is a deep-rooting mix of tall fescue, ryegrass and creeping fescue, the species Barenbrug develops to cope with both.
Backed by Barenbrug
One of the world’s biggest grass-seed companies, developing lawn and sport varieties since 1904. The same grass they supply to golf greens and pitches goes into your bag.
Amenity grass, not field seed
Lawn-and-sport varieties, chosen for a finer blade and a deeper green, and far tougher than the agricultural seed often bagged up cheap for gardens.
Roots that reach deep
Tall fescue drives roots far down, to find water when the clay bakes hard and hold firm when winter turns it to a bog.
Will it work in my garden?
Made for the gardens nothing else likes
Most of the questions we get start with “my soil sits wet…”. Here’s the honest answer at a glance.
Heavy clay
Built for it
Winter wet
Short spells
Summer drought
Deep roots
Foot traffic
Good wear
Permanent flood
No grass can
Plan the lawn
Get the right amount before you sow
Enter your lawn size or check this is the right mix before you sow.
Product details
How it grows, what it suits and what to expect
The practical detail behind the mix, from germination timing to reviews and specifications.
What’s really in the bag
Three grasses for tough ground
Three grasses, chosen to survive the two things clay throws at a lawn: water, then drought.
The scienceDeep-rooting tall fescue
Roots that dive deep, for water in a drought and grip in the wet
Tall fescue roots reach much further down than ordinary lawn grass. When clay bakes hard and dry in summer, they pull moisture from deep in the soil. When winter turns it wet, those same roots hold firm. It’s the one grass genuinely built for this.
The sciencePerennial ryegrass · recovery from wear
Establishes fast and bounces back, even on heavy clay
Clay is hard to get going on. Ryegrass is one of the few grasses that germinates well on it, and it recovers quickly from wear, so the lawn fills in fast and keeps coming back through the seasons.
The scienceTolerates periods of waterlogging
Shrugs off short spells of standing water
A heavy downpour that leaves the lawn under water for a day or two? No problem. We say “periods of waterlogging” on purpose, because no grass on earth survives weeks underwater. Aerate the clay a few times a year and this mix will keep coming back.
When you’ll see green
A little patience on clay pays off
The ryegrass shows first; the deep-rooting tall fescue takes longer but it’s worth the wait.
Day 0
Sow into warm soil (≥15°C)
Days 7–10
Ryegrass shoots first
2–3 weeks
Green coverage
Up to 4 weeks
Tall fescue fills in & roots deep
Real results · a real customer’s garden
A boggy clay lawn, transformed
Drag the slider to see the difference.
Before
After
Customer reviews
What real gardeners say
Let’s clear this one up
“My lawn floods. Isn’t it a lost cause?”
The worry
“Water sits on my clay for days and everything I’ve sown has died. There’s no point trying again.”
It’s a fair worry, and you’re half right. Ordinary lawn seed will drown on wet clay. That’s exactly why most seed fails here.
The honest answer
The right grass copes, within the limits we’ll be straight with you about.
Deep-rooting tall fescue is one of the only grasses developed for soil that sits wet then bakes hard. It handles periods of waterlogging and shrugs off summer drought.
Short spells of standing water: fine. Weeks underwater: no grass survives that.
Aerate 3–4 times a year and you’ll keep compaction, the real enemy, at bay.
No surprises
What to expect, and who it’s not for
We’d rather set this straight now than have you disappointed later.
What to expect
- Green coverage in 2–3 weeks; a little longer on heavy clay.
- A lawn that copes with seasonal waterlogging and summer drought.
- Deep roots that hold firm where ordinary seed gives up.
Good to know
- It tolerates periods of waterlogging, not a permanently flooded garden.
- Tall fescue is slower (up to 28 days) and a touch coarser left long.
- Aerate the soil 3–4 times a year. Compaction is what really kills clay lawns.
How to aerate clay (the bit that makes or breaks it)
Once in spring and once in autumn, push a garden fork (or a hollow-tine aerator) 10–15cm into the lawn every 10cm or so, and wiggle. It opens channels so water drains and air reaches the roots. On heavy clay, brush a little sharp sand into the holes. That’s the single biggest thing you can do to keep a clay lawn alive.
The detail
Specifications & characteristics
Specifications
Sowing rate30–35 g/m²
Germination14–28 days (soil ≥ 15°C)
Mowing heightDown to 15 mm
MixtureTall fescue · perennial ryegrass · strong creeping red fescue
Bag sizes5 / 10 / 20 kg
Best sownLate spring–autumn
Characteristics
Waterlogging tolerance★★★★★
Drought tolerance★★★★★
Wear tolerance★★★★★
Density★★★★★
Speed of establishment★★★★★
Fineness of leaf★★★★★
Questions, answered
Before you buy
How long does it take to germinate?
14–28 days. The ryegrass shows first (around 7–10 days), but the deep-rooting tall fescue takes longer, up to four weeks, and needs warm soil (around 15°C) to establish. Patience on clay really does pay off.
My lawn floods in winter. Will this survive?
It’s built to handle periods of waterlogging. A day or two of standing water after heavy rain is fine. What no grass survives is weeks submerged. For most British clay gardens that sit wet then dry out, this is the right mix.
Do I need to aerate, and how?
Yes, ideally 3–4 times a year. Push a garden fork or hollow-tine aerator 10–15cm in every 10cm and wiggle, then brush sharp sand into the holes on heavy clay. Compaction (not the wet itself) is what stops water and air reaching the roots, so this is the most important job you’ll do.
When’s the best time to sow?
Late spring to early autumn, once soil temperatures are reliably around 15°C. The tall fescue needs that warmth to germinate well.
How much do I need?
Sow at 30–35 g/m². A 10kg bag covers roughly 285–330 m². Use the calculator below for an exact figure.
Why is there ryegrass in a clay mix?
Because it’s one of the few grasses that establishes well on clay and recovers quickly from wear. It gets the lawn going fast while the tall fescue does the deep-rooting heavy lifting.
How much seed do I need?
Pop in your lawn size and we’ll do the maths.
Not sure this is the one?
Answer a few quick questions about your garden and we’ll point you to the perfect mix.
Find your perfect seed