There’s a reason all lawn care service providers use granular fertiliser instead of 4-in-1 products. Because it’s better!
Fertilisers can be told apart by their NPK levels. N for nitrogen. P for phosphorus. K for potassium. Here they are broken down in their simplest terms for your lawn: 

Nitrogen: promotes green growth above the soil which the plant uses for photosynthesis.

Phosphorus: promotes growth below the soil. Essential for root health and early plant development.

Potassium: used for absorbing water from the soil and helps grass flourish and fight off disease.

Each season requires different nutrients for your lawn to thrive and cope with whatever conditions the temperamental UK weather can throw at it! 


In spring you need to feed your lawn with nutrients to maintain lush growth without the need for excessive mowing.

Ideal NPK: 22-5-10


In summer you want to be aware of drier spells so a slow release fertiliser is always best.

Ideal NPK: 19-3-9


Time to prepare the lawn for colder months ahead. Lower levels of nitrogen should be used to maintain green colour while avoiding disease-prone soft growth.

Ideal NPK: 10-5-10


Use a fertiliser or conditioner to support root development for strength over the colder period to prevent disease.

Ideal NPK: 6-5-10


Seeding is a special case. When you are seeding you want the new seedlings to develop deep and strong roots for long term success. This requires a fertiliser designed for this rather than for promoting only growth above the soil. Also, if you are overseeding (filling out an existing lawn) you don’t want your existing grass to grow too lush and outcompete the new seedlings.

Ideal NPK: 6-10-8