Lawn Thickener

Lawn Thickener

The ideal solution for reviving tired, thinning lawns and creating a denser, healthier sward in record time.

Formulated with premium dwarf perennial ryegrass, this mix establishes quickly, fills in bare or weak patches, and improves the overall appearance and resilience of your lawn. Its fine yet durable growth habit ensures a strong, uniform surface that stands up to family use, pets and everyday wear. The unique SeedBooster® coating gives Lawn Thickener an extra performance advantage, helping more of your seed stay where it’s sown. SeedBooster® also encourages stronger early root development and faster establishment, meaning you’ll see visible improvement much sooner than with untreated seed.

  • Rapid Lawn Thickening
  • Naturally Unattractive to Birds
  • Child, Pet & Wildlife Safe

Available in 425g & 1.275kg

Mixture Breakdown

Grass Species Mixture Percentage
Amenity Tetraploid Perennial Ryegrass 100%

 

All grass varieties used in Johnsons mixtures are premium amenity quality, chosen for their proven performance in UK lawns. While specific cultivars (individual named strains within a species) may occasionally vary depending on seed availability from season to season, we will only substitute cultivars with others that offer the same high level of performance.

 

Amenity Tetraploid Perennial Ryegrass

Tetraploid perennial ryegrass represents a significant advancement in amenity turf breeding, offering enhanced stress tolerance, rapid establishment, and exceptional resilience. Developed through selective breeding programmes such as those pioneered by DLF, tetraploid cultivars carry double the chromosome number of traditional diploid ryegrasses, resulting in a range of performance benefits ideally suited to modern lawn and landscape demands.

Tetraploid perennial ryegrasses are used selectively within Johnsons Lawn Seed mixtures to:

  • Improve durability and recovery rate

  • Enhance drought and wear tolerance

  • Support rapid establishment in new lawns and overseeding applications

  • Maintain consistent turf quality under variable conditions

These cultivars are fully amenity-grade and subject to rigorous quality assessment by the STRI.

 

 

 

 

Seedbooster® Seed Treatment

SeedBooster® is an innovative two in one seed coating developed for the professional turf market.

An innovative two in one seed coating developed for the professional turf market. Each seed is wrapped in its own parcel of fast and slow release fertiliser, the seed germinates sooner and establishes faster resulting in up to 30% more grass and a denser law than by sowing seed and fertiliser separately. This makes it particularly effective when used on slower to establish finer grasses, such as those in Shady Place and Luxury Lawn and for improving existing lawns with Johnsons Lawn Thickener. An added benefit is that the coating also acts as a harmless deterrent to birds.
 

Suitable for both new and existing lawns, including high traffic and pet-friendly areas. 

Apply between March & October, when soil is warm above 10°C and grass is actively growing. For best results, apply straight after mowing and remove clippings to ensure excellent seed-to-soil contact. 

 

How much to use

Use a rate of 35g per m2 fo a new lawn and 20g per m2 for overseeding an existing lawn.

Handy guide: one average handful is approx 32g

 

How to sow

How to sow a new lawn

How to overseed an existing lawn

How to repair a patch

 

Lawn after care

  • Immediately after sowing: Water throughly to settle the seed into the soil
  • During the first 2 weeks: Keep the area consistently moist to support strong germination and avoid heavy traffic while grass establishes (this includes pets)
  • Weeks 1 to 2: Once the grass reaches around 5-8cm, you can mow for the first time. Keep the mower blades high for early cuts.
  • Weeks 3 to 4: Gradully return to your normal mowing height and routine as the grass strengthens.
  • Ongoing: Reapply or overseed worn areas seasonally, this is to maintain lawn thickeness. 

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