Choosing Fertiliser

Finding the right fertiliser product for professional lawn treatments can seem complicated. A wealth of fertilisers are available but not all of these are cost effective or suitable for use on a domestic lawn. The best approach is to consider your goals and choose with these in mind.

Spring Spring is the time to apply high nitrogen fertiliser for lush green grass growth. A product with a high percentage of slow release nitrogen will prevent excessive growth so no extra mowing is required. It will also maintain the lush green growth right up until the next lawn treatment in the summer.

Ultimate 22-5-10 +2.5%MgO

Summer In summer you can save time and money by applying a fertiliser with a low risk of scorching the grass so that it doesn’t need to be watered in. Organic fertilisers and biostimulants (e.g. seaweed extract) can also be applied to increase drought tolerance; keeping the lawn greener for longer and helping it recover quicker.

DroughtSafe 19-3-9

Autumn In autumn it’s appropriate to use a fertiliser high in potassium. This will strengthen the roots and prepare the grass for better disease resistance through the winter ahead.

AutumnGreen 10-5-10 +2%MgO
First and Last 6-5-10

Winter Avoid applying high levels of nitrogen in winter as this will cause soft growth that is susceptible to disease. Due to the low soil temperature, the lawn will often become dormant so any fertiliser applied should be low in nutrients.

First and Last 6-5-10
Black & Green 12%Fe 5%MgO
Rich Green 5-0-0 +9%Fe

Other Products Products containing iron (Fe) or magnesium oxide(MgO) can be used any time of year to quickly green up the lawn. Products containing high levels of iron fertiliser are also used for their moss blackening properties which can help with moss control.
Biostimulant liquids can be used in the warmer months to boost soil health.

Liquid Iron 6%Fe
Liquid Seaweed

New Lawns New lawns will establish faster and more successfully with an application of fertiliser. Apply a high-phosphorus feed before seeding or under new turf to support the new growth. Encourage customers to water new lawns until established to increase the chance of success.

Seed Starter 6-10-8 +2%MgO

Granule Size

Sometimes referred to as SGN or particle size, the granule size of a product relates to the size of each granule in the fertiliser. Most SmartLawn fertilisers are available in a choice of two granule sizes allowing you to choose the one that suits your needs. There is no need to worry about the height at which the lawn will be mown; both sizes are suitable for any domestic lawn.

Mini Grade (1-2mm)
SmartLawn 1-2mm mini grade fertiliser granules
Good coverage even at low application rates
More particles per square metre mean this product is less likely to cause speckling when applied at lower application rates.
Quick to dissolve
Smaller granules dissolve quicker and do not hang around on the surface for as long. Fast release nutrients will be available to the plant quicker.
Low visibility after application
Small particle size allows the product to settle discreetly at soil level out of view.
Lawn Grade (2-3mm)
SmartLawn 2-3mm graded fertiliser granules
Easy to apply
Visible granules help you avoid a patchy lawn by being able to see where the product has and hasn’t already been applied.
Covers large areas quickly
Larger, heavier, granules allow a wider spread as the product is able to fly a greater distance.
High visibility after application
Customers can see the product on the lawn and feel assured that a treatment has been carried out.

Liquid vs granular lawn fertiliser

A liquid fertiliser treatment is perfect for providing an instant nutrition boost to the lawn and can take effect in only a few hours. They are ideal for use before an important event when rapid colour improvement is required and for supplementing granular treatments. Granular lawn fertilisers often provide longer lasting nutrition and can be designed to release their nutrients slowly, keeping lawns looking green and healthy between treatments.

For more information on granular vs liquid fertiliser please read our blog post – Liquid vs. granular fertilisers.