Feeding Your Lawn Through the Year

Whether you are buying and laying new turf or maintaining an established lawn, feeding your lawn is a very important part of routine lawn care. Knowing what to feed and when is the best time to feed a lawn, however, is just as important. And with so many different lawn products available, each promising different things, it can be very confusing indeed! This page will help you to understand what to feed and why.


The principal ingredients of good lawn fertilisers are a combination of nitrogen (N), phosphorus (P) and potassium (K). These are the essential nutrients which the grass uses up quickly and which need replenishing. But what do they actually do?

  • Nitrogen helps to promote sturdy plants, giving strong shoots and leaves and dense growth which helps to reduce competition from weeds
  • Phosphorus helps the grass to establish and grow strong root systems.
  • Potassium reduces the impact of stress on the plant by giving it resistance to drought, disease, wear and tear and cold weather.

Our own Harrowden Turf lawn fertiliser (in three varieties – Rapid RootsVivid Green and Rejuvenator) also contains organic carbon to nourish the microbes in the soil which makes it easier for the grass to absorb goodness from the soil, and magnesium (an essential component of chlorophyll) along with sulphur, both of which give your lawn its wonderful green colour.

How to Choose Lawn Feed

When you think about our British weather, it is obvious that your grass will need these nutrients in different proportions at different times of the year. The ideal ratio also depends on the type of lawn you have – fescue and bent combination or principally ryegrass. Most people’s lawn is the first, a combination of species, and below we consider the different seasonal needs your grass may have.

What should I feed my lawn in spring?

Around March time, you should give your lawn a spring feed. The weather is warming up and your grass is beginning to grow more strongly, so it will need a feed that contains plenty of nitrogen to support growth above the soil. And if you are scarifying your lawn, do this first and feed afterwards once you have removed the moss and debris.

What summer lawn feed should I use?

Your lawn definitely needs a summer feed. With the stronger sunshine and drier conditions, it is important not to scorch the grass with the fertiliser. This means avoiding feeding your lawn with high iron or sand content. The best feeds are granular, so in the summer you might need to be ready to water it in if there is no rain imminent.

Does my lawn want an Autumn grass feed?

The answer is yes – but as the weather begins to turn colder, your grass needs some extra help to keep strong root systems down below. This is why good autumn and winter feeds are lower in nitrogen but still have plenty of phosphates and potassium.

Is it necessary to feed my lawn in winter?

A winter feed can really help your lawn to remain healthy and strong through the toughest season, ready for a burst of growth in spring. Our Rejuvenator Autumn/Winter Lawn Feed has just the right ratio of key nutrients to help your grass resist the ravages of pests, diseases and frost damage.

How much fertiliser do I need?

You should always be guided by the instructions on the packet. With our Harrowden Turf feeds, for example, 2kg will feed 100 square metres of lawn. It is a good idea to plan a feed every 6-8 weeks in the growing season.

About Harrowden Turf Lawn Feed

At TurfOnline we have always used the very best lawn fertilisers to look after our turf. Working with plant nutrition specialists, we have created our own range so that you can treat your own lawns to the same healthy diet. And by being designed with the entire lawn environment in mind, our food is not just good for your grass; by keeping the microscopic soil-inhabiting creatures happy, Harrowden Turf fertilisers actually help your lawn to absorb more carbon dioxide from the air, doing its bit to counter global warming. That’s why feeding your lawn with our feed is highly recommended!

We also provide a Rapid Roots pre-turfing/seeding feed. This is ideal for adding to your prepared soil before laying your new turf.

Can I use combined feed and weed lawn feeds?

A single product that does two jobs sounds too good to be true. And the truth is that these combined ‘feed ‘n’ weed’ options will never give you quite as good a result as separate products.

Whilst a healthy lawn doesn’t leave much room for weeds, getting your lawn nutrition right is not the same as applying a weed control chemical. Each needs its own optimum type of application, at the correct time and in the correct volumes. So, for good lawn care, choose a good fertiliser and, if necessary, select a good weed killer – and follow their instructions carefully.

More information about feeding your lawn

If you need further information, we recommend David Hedges-Gower’s book, Modern Lawn Care.