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Lawn is becoming Yellow or Browning

Lawn is becoming Yellow or Browning

Your lawn may turn yellow or brown due to several things such as, being sick with a disease, having gone dormant or simply nutrient deficient.

Once you identify why your lawn is going yellow or brown you can then assume a management plan or rest easy that all is alright.

So what can be causing your lawn to become yellow or brown?

Reasons Lawns Lose their Dark Green Colour

Lawn Disease

Lawn with Lawn Disease

Lawn diseases can be more common than people realise, and are most easily diagnosable when patches of turf lose colour, get sick or even die.

The key to beginning to suspect a lawn disease is when a very small spot begins and continues outwards and expands into circles or irregular shaped patches.

For the purpose of this article, we will concentrate on general lawn health, which can be suspected and seen as different from a lawn disease when it affects the entire lawn and not just patches or circles.

Lawn Rust

Rust is a fungal disease that occurs on your lawn when it’s growth is slowed.

Rust usually appears in late summer or early autumn and during periods of dry weather or when the grass is low on nitrogen.

Lawn Rust weakens the strength of your lawn and makes it more susceptible to other diseases and turf problems.

The Rust is identified by pulling a couple of blades out of the lawn. The lawn blades will be coated with orange-red to yellowish brown dust or spores.

Lawn rust begins with yellowing leaf blades and small yellowish spots which mature to orange, red or brown colouring.

The Rust’s spores can be rubbed off the grass blades with a finger. Overall, rust patches of grass become thin and weak.

For control of Rust disease, myhomeTURF recommends a good broad spectrum fungicide – such as Indigo Voltar. 

Poor General Lawn Health

The most common reason a lawn will turn yellow or brown is due to something lacking in the lawn, which in turn is making the lawn sick.

The most common causes of lawns turning yellow or brown are lack of nutrients, such as nitrogen, or lack of water.

Steps to fix a nutrient deficient lawn

Fertilizing Your Lawn

Fertilising Lawns

There’s just no way around this one, and it’s the number 1 reason lawns lose their colour and become sickly – a lack of nutrients.

Lawns need nutrients, these are fed to the lawn in the form of lawn fertilisers, and should be applied all year round at 6-8 weekly intervals.

Rule of thumb, is to fertilise you lawn each season.

Lawn fertilisers contain all the nutrients lawns need to survive, thrive, and stay healthy and green.

All homeowners should implement a good lawn fertilising regime as just normal lawn care practice.

Watering Lawns

Watering Your Lawn

Watering lawns often seems like a relatively simple task but is so often not managed properly by many people, as a result, lawns suffer.

Watering should only be done in the morning, this prevents lawn diseases from establishing and gives lawns the water at the only time they can absorb it – which is during the day.

Watering at night simply wastes large amounts of water and can cause the build-up of mildew which promotes disease.

If necessary, watering and reticulation times should also be monitored and adjusted as necessary.

Watering lawns also extends to the area of water retention in the soil.

If your lawn has poor soils then water cannot properly spread throughout the soil profile, nor can the soil hold onto water for long periods of time if it is water repellent.

Regular applications of Wetting Agents should be applied at least twice a year to aid in the water friendliness of the lawn soil.

Other Factors Affecting Lawn Health

If water and nutrients have been taken care of, then other minor elements can be looked at which may be affecting the health of a lawn.

Lawn dormancy

To protect themselves during the cold, frosty season lawns go into a state of dormancy, where they have slow or almost no growth.

Lawns also go into dormancy during the dry season when water is scarce, the lawn shuts down to reduce using water and focuses on putting all resources into the roots.

Most lawns can stay in a dormant state for at least three to four weeks without the grass dying. During the dormant period of a lawn, little maintenance and mowing is required.

High Winds Causing Lawns to Dry Out

Lawns which are affected by high winds can have their soils dried out very quickly. This, however can be monitored with watering times adjusted according to the time of the day with least wind and, perhaps more water applied to account for the water loss from the wind.


Frost occurs on your lawn when the ground cools down to a temperature lower than the air next to the surface.

The moisture or dew that blankets your turf is caused by the water vapour in the air.

When turf is frost damaged it will be obvious through the appearance of yellow or brown patches throughout the lawn.

There is not much you can really do to prevent frost damage on your lawn unless you blanket the entire area. 

However a healthy lawn improves its chances of a full and speedy recovery from frost damage.

Close Proximity Living Conditions

With rapid over-population affecting every city in the country, more and more homes are being built closer together.

The result is the creation of massive heat traps of bricks, concrete and paving sitting alongside an equally hot road. Sometimes a lawn is put into such environments to create a ‘touch of green’. In these situations it would be best to increase watering times and/or frequency, as required, to reduce the lawn’s heat stress.


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