A white bottle of Seaweed Lawn Booster by iGrow Carpet, standing on a green lawn.

Seaweed Lawn Booster 8% 1L

5.0 (4 reviews)

In Stock

£24.99

Feed your soil, not just your lawn. Our professional seaweed booster strengthens roots, improves soil health and supercharges every feed you apply.

Why It Works

✓Improves soil health and boosts microbial activity
✓Feed the soil, not just the grass
✓Encourages deeper roots for a healthier lawn
✓Safe for kids and pets when used as directed

Coverage Area:

1L | Covers up to 500m²

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Product Overview

Feed the soil, not just the grass.

A concentrated seaweed made from Ascophyllum nodosum, harvested from the west coast of Ireland. It enriches the soil with natural growth promoters, trace elements and amino acids. Creating the conditions your grass needs to thrive from the ground up.

Use it alongside your regular fertiliser programme any time of year to improve soil health, reduce stress and stimulate growth.

The science bit

8% Seaweed
A concentrated source of natural nutrients derived from Atlantic seaweed, used as a soil conditioner for centuries.

Natural Growth Promoters (Cytokinins, Auxins, Gibberellins)
Plant hormones that help your grass use applied fertilisers more efficiently and stimulate healthy, sustained growth.

Trace Elements (Sulphur, Calcium, Magnesium, Iron, Copper, Zinc, Boron, Manganese)
Micronutrients that relieve stress in the lawn and support overall plant health.

Amino Acids
A full profile of naturally occurring amino acids that support microbial activity in the soil, strengthening roots and improving resilience.

Technical Specifications

Total Weight

1 kg (1 Litre)

Coverage

250-500m²

Application Time

Year Round

Reapplication

4 weeks

Standard application:

A 1 litre bottle treats up to 500m² at the standard rate — use our lawn measurement tool to calculate how much you need
Mix 200ml per 100m² diluted in 3 to 5 litres of water per 100m²
Apply evenly using a garden sprayer for best results — a watering can can also be used
Do not mow for 24 hours after application
Keep pets off the lawn during application and until dry
Avoid applying during extreme heat, drought or frost

After stress such as drought:

A 1 litre bottle treats up to 250m² at the higher rate — wait until the lawn has recovered and is no longer under stress before applying
Mix 400ml per 100m² diluted in 3 to 5 litres of water per 100m²
Apply evenly using a garden sprayer for best results — a watering can can also be used
Do not mow for 24 hours after application
Keep pets off the lawn during application and until dry

Q: How much do I need?

A 1 litre bottle treats 250 to 500m² depending on the application rate. For regular maintenance and healthy lawns, the lower rate covers up to 500m². For stressed, patchy or nutrient deficient lawns the higher rate covers 250m². Use the higher rate if your lawn is recovering from drought, heavy use or poor soil conditions.

Q: How often should I apply it?

Once a month year round alongside your granular fertiliser programme.

Q: How do I apply it?

Dilute and apply with a garden sprayer or watering can.

Q: Will I see an instant result like the iron?

Not in the same way as seaweed works beneath the surface improving soil health and root strength, so the results build over time and make everything else you apply work better.

Q: Is it safe for kids and pets?

Yes, it's a natural product and safe once applied.

Precision Tool

Measure Your Lawn

Use our free interactive tool to measure your lawn's exact square meterage. Get accurate product recommendations and cost estimates based on your lawn size!