There are several causes of burned grass, so it pays to work out which is the reason before beginning the repair process:
If the weather is hot and sunny, you may find brown patches of sunburnt grass. A good watering will help revive the appearance of your lawn – but do it in the early morning or late evening so that the water doesn’t immediately evaporate off.
Using too much fertiliser – or not watering a product in well enough – will result in scalded patches. It’s best to avoid applying fertiliser during hot summers, as the risk of burning is higher. The solution is to cut out the dead parts, then either fill with topsoil and reseed, or use fresh turf cut to fit.
Owing to its high concentration of nitrogen, dog urine has a similar effect on a lawn to that of over-fertilisation. Feeding a higher quality but lower protein diet, and ensuring better hydration (for example, by soaking dry food) will reduce nitrogen levels in your pet’s urine, or add a proprietary product to their drinking water. Watering your lawn regularly will also help to dilute the urine.
Unfortunately there’s not much to be done when your lawn has been damaged by a bonfire or barbecue but remove and replace, as the high temperatures will have killed off the grass completely. Small areas can be raked, spiked and re-seeded, but larger patches will need to have the charred grass cut out and replaced with new turf, or filled with topsoil and reseeded.
Is there hope for your burnt lawn?
Finally, before you begin to cut out a ‘dead’ patch from your lawn, look at it carefully. If you can see green shoots, then the grass is dormant rather than dead, and it will begin to repair itself as its roots begin to grow again.
If there are no signs of life, then your best bet may be to cut out the dead parts, then either fill with topsoil and reseed, or use fresh turf cut to fit.