As a general rule of thumb, you should aim to fertilise your lawn during a growth phase. A great time is early spring, after the grass has been dormant in winter. Summer & Autumn are also good times. In South East Queensland, try to avoid fertilising during the rainy season though as it will wash away all the nutrients.
If you have just put turf in or are about to lay turf as part of a landscaping project, then we recommend you apply a good fertiliser to the soil before the turf goes in. One with a wetting agent will help the new grass roots retain moisture and help the turf establish itself.
After turf is installed, fertilise again about 6 weeks later and then aim to establish a regular pattern (3 or 4 times a year) to keep it healthy and nourished.
When to Fertilise
Spring is an important time to fertilise. To get your lawn working and out of winter dormancy, apply a complete fertiliser high in nitrogen in September to get your lawn out of hibernation.
Fertilising in summer helps your lawn maintain an even growth pattern. After strong growth during spring your lawn needs another application of complete fertiliser. Regular mowing and watering will ensure your lawn looks the best. Most fertilisers have added nutrients which will help to give your lawn the correct nutritional balance for health.
Autumn & Winter
Fertilising in Autumn prepares your lawn for the colder winter months. It promotes growth to ensure a thick coverage and extended colour. This application is the most important one of the year. The optimum times are March and again in April/May. A fertiliser high in potassium will give your lawn protection going into the colder winter months.
Applying your Fertiliser
Lawn fertilisers work differently across brands and types. Some require plenty of watering in when applied and give your lawn very fast growth, whilst others are slow release types requiring minimal watering and provide nutrients over a longer period.
When you scatter solid fertiliser on the lawn, it stays on the grass and soil until dissolved by rain or watering. This is why we always recommend that you water a fertiliser in even if rain is forecast. That way you can be sure the fertiliser has been dissolved and will start to work on the lawn. Once it dissolves into the soil, it is broken down into nutrients that can be used by the lawn roots and feed the plant.