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How to Prevent Yellow Grass

The last thing you want is to notice that your beautifully manicured lawn is suffering. Yellow patches of grass can be quite unsightly and can be the sign of fairly big problems. Luckily not all causes are serious and understanding the problems can make remedying them much easier.

Here are our top causes of yellow grass so you know what to guard against.


If you are noticing that the tips of your grass blades are yellow, while the rest remains green, this could mean that your lawnmower blades are too blunt. If this is the case it means that, instead of a clean cut, they are tearing the grass, which dries out the tips. Sharpening or replacing your blades is not a particularly difficult task but you will need to check the manufacturers instructions as to the correct course of action.


The petrol itself can damage the grass so you should always be careful when you are refueling your mower. If you have the space you should try to refill your machine off the grass just to make sure that it’s protected. If you do accidentally spill petrol on your lawn you will need to quickly clean this up. You will need to dilute the area with water to minimise the damage, add something absorbent to collect the fuel and then dispose correctly. If you are unable to save your lawn when you spill petrol you may need to dig this area of your lawn up and then reseed to restore it to its green glory.


You will need to be careful not to cut your grass too short as this can cause your grass to lose its colour. The grass needs moisture to grow and, if you cut too short, the blades of grass will lose this. You will often see this happening fairly soon after cutting so it will be easy to spot. If you are getting yellow or brown patches in your lawn after cutting it is most likely that you are cutting it too short. If you have an uneven garden this is quite common.

You should, therefore leave it to grow a bit longer and then raise the cutting height next time you are set to give it a trim. If you are able to flatten out your garden you should also look into this as this will make cutting your grass much easier in the long term.


Nitrogen is very important in encouraging growth in the lawn, which is why it’s present in most fertiliser ratios. It enhances sturdy growth and not enough nitrogen can cause problems with the lawn. Unfortunately, too much nitrogen can also cause the lawn to turn yellow. Too much nitrogen can burn the roots and affect the pH of the soil. This is why dog urine can also have this effect, as it is usually high in nitrogen, which can cause burn spots in the grass.

You can protect yourself by diluting the nitrogen with water as you water the grass. This also helps with your trusty four-legged friend as watering the spot where he has relieved himself can also protect your lawn. It may also be worth training your pooch to find a different spot in the garden.


As mentioned above, the grass needs moisture to grow. If you have a prolonged period of hot days in the middle of summer, this can cause the grass to dry out. This can happen in just a couple of days depending on the type of grass you have so it is easy to spot. The most likely problem is that your root structure is on the shallow side. Watering the lawn will help in the short term but to tackle the whole problem you will need to encourage a deeper root growth.

To do this you will need to water less frequently but more thoroughly. This means the roots will grow downwards looking for the water they need. If you frequently water but not as thoroughly the roots do not need to venture far, which makes them at risk of drying out when the weather is warmer.


Grass can turn yellow through soil compaction and compression. As such garden swings, trampolines or other heavy furniture items can cause the grass underneath to turn yellow. The soil particles are compacted so close together that the water and oxygen cannot circulate, which then prevents the grass from growing healthily.

In order to fix this you will need to aerate the grass after moving the heavy items. You can do this by pushing a garden fork into the ground so the air can get into the soil.