How To Apply Our Fertiliser
Want to get the best results? Our free Beginners Guide to Fertilising Your Lawn covers everything from spreader settings to professional application techniques.
Standard application:
After stress such as drought:
Q: When should I apply it?
June to August. Avoid applying during a heatwave or drought as you should wait for a cooler spell or before rain.
Q: How much do I need?
Our fertiliser can be applied at 25 to 35 grams per m². We recommend 30 grams per m² as the ideal rate as it gives great results while allowing for a little overlap around edges. Use our lawn measurement tool on the website to calculate exactly how many bags you need based on your lawn size.
Q: How quickly will I see results?
4 to 7 days after it's been watered in.
Q: What's the best way to water it in?
We recommend using a sprinkler as depending on your water pressure, a 15 to 20 minute soak is enough to get the product working. If rainfall is forecast within the next 48 hours that will also do the job, as long as it's not just a light shower.
Q: Will it stain my patio or driveway?
It shouldn't as our granular products are iron free. That said, it's always best to brush or blow any product off hard surfaces before watering in, just to be safe.
Q: How long does it last?
10 weeks in normal conditions. If there's been little rain and slow growth it can stretch to 12 weeks.
Q: Can it burn my lawn in hot weather?
Not when used as directed. Water it in within 48 hours of applying.
Q: Do I need a spreader?
Yes as a spreader gives you even coverage and prevents patchy results. Hand spreading isn't recommended.
Q: What spreader setting should I use?
This varies by spreader model and walking speed. We have a quick start guide on the learning hub.
Q: Can I apply it in the rain?
Light rain after applying is fine and will help water it in. Avoid applying just before very heavy rain as it can wash the product off the lawn before it has a chance to work.
Q: What if I accidentally over-apply?
Water the area thoroughly straight away to dilute the product and reduce the risk of any scorch.
Q: Can I apply it to a newly seeded lawn?
Yes, but also check out our Pre-Seeder which is specifically designed to give new seed the best possible start.
Q: Is it safe for kids and pets?
Yes, once watered in and dry. Grazing pets like rabbits and guinea pigs should be kept off for two weeks or three cuts, whichever comes first.
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.
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!

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Quick delivery and good quality products.
Extremely happy with my seaweed lawn booster and autumn fertiliser. Managed to get it down just in time to see effects before the winter weather gets too bad.
Great product - thoroughly recommend
Great product and purchased to give my newly renovated lawn the best chance of a great start into 2025z Easy to understand and apply. Great business and products - have used alongside the seaweed
Used the seaweed regularly since new lawn laid in May. Very pleased with the results.