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Summer Fertilising

Posted on January 29, 2021 by Greg Pelka

If you did a hearty fertilise of your lawn in spring, it is likely due for another application. A majority of the common, slow release fertilisers will provide nutrients for your lawn for up to 12 weeks – this means that if you fertilised in early – mid spring, around this time is a great top-up choice.

So, here is a guide on how to get the most out of your summer fertilising!

Image courtesy of Lawn Solutions Australia.

Why fertilise in summer?

There are a few reasons as to why you should fertilise your lawn in summer:

  1. It helps your lawn maintain an even growth pattern, as most fertilisers add minor nutrients (which work to allow your lawn the correct balance of nutritional requirements).
  2. There is usually a lack of nutrients within your lawn come summer time.
  3. Nutritional supplements during summer allows your lawn to stay in consistently good shape, even during warm weather.

If you are unsure in any way, always speak to your local lawn specialist for a little extra help and information.

Things to consider when summer fertilising

When it comes to applying fertiliser during the warmer months, make sure you consider the following:

Read the labels

When getting ready to apply fertiliser, always make sure you read the label carefully. As a general guide, 20g per square metre is a good estimate to work by – so 2kg will do a 100m² lawn area – however always read your fertiliser label first.

Application time

Do not apply fertiliser in the middle of the day, when the temperature is at its hottest. When possible, fertilise late in the afternoon or early in the morning and, if the temperature is due to be really hot, try and wait until another day if possible.


After you have applied your fertiliser, you must ensure you thoroughly water the area. If you do not, you run the risk of burning the leaf of your lawn – which is not something that you want!

If you don’t have a pop-up irrigation system, it’s a good idea to apply fertiliser before rain where possible to save water. You can also set up a sprinkler or water it well by hand with a hose, however always ensure your sprinkler has a large reach and can offer a good drenching. Everything you need to know about watering your lawn can be found here.

Note: If a lot of rain is forecast, it may be best to wait as the fertiliser could be significantly displaced or washed away.

Application on wet lawn

Always make sure you apply fertiliser to dry lawn, not wet! Fertilising an already wet lawn can cause damage to an already wet leaf that is now being subjected to fertiliser – not ideal.

Lawn pH imbalance

If your lawn has an pH imbalance, fertilising won’t be as effective. Test your soil’s pH level to ensure your lawn is able to absorb the nutrients it requires, instead of applying additional fertiliser, as this could be potentially harmful. More information regarding lawn pH levels can be found here.

Leaf burn

If you put too much fertiliser on your lawn in summer, or apply it incorrectly, you may find yourself with a lawn suffering from leaf burn. Leaf burn shows itself as a scorching or burning of your turf and can occur if fertiliser is applied during the heat of the day or if applied to an already wet lawn. Fertilisers contain salts which can draw moisture from the leaf, resulting in browning or yellowing discolouration and even root damage.

How do you fix leaf burn?

If your lawn is suffering from leaf burn, definitely consider using Lawn Rescue. Lawn Rescue is designed to restore lawns that have lost colour and appearance due to drought, heat or lack of water and nutrients. This makes it a good option to use in summer in general, but also if your lawn has suffered from some leaf burn.

Another option you can consider is ColourGuard, especially if your lawn has lost a lot of its vibrant green colour due to leaf burn. ColourGuard is a natural pigment with a liquid fertiliser, and it’s a great solution to keep your grass green and to save water at the same time. If you are primarily looking for an instant green up and your lawn has slowed in growth due to high temperatures, ColourGuard is the perfect solution. ColourGuard does however grow out with the existing leaf, so if your lawn is growing quickly it may be best to look at alternative fertiliser options like Lawn Rescue or a slow release granular fertiliser instead for more long-lasting results.

If you would like to know a little more about fertilising and your lawn head to one or more of the below:

  • Why fertilise your lawn? We tell you here.
  • Some info regarding fertilising fails and how to fix them can be found here.
  • If you are worried about your pets and fertiliser, learn more here.
  • Can you over fertilise your lawn? The answer can be found here (and the answer is yes, yes you can).



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Greg Pelka

We are a local, Sunshine Coast turf grass company with a committed team to providing a quality lawn. Like any small business it's the people who make it great. Above are the friendly staff you'll meet and deal with when ordering turf from Rosemount Turf.

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