Thatch is naturally occurring and is essential for a healthy lawn, however too much can have the opposite effect.
When to scarify your lawn?
There is no exact time when you should scarify or de-thatch your lawn however, suitable gardening conditions are needed. You will need plenty of sun to allow the grass to grow strongly after de-thatching. It is essential that the grass is able to grow quickly after scarification so you should avoid scarifying your lawn in periods of drought or extremely dry conditions, as this isn’t conducive to strong grass growth. Similarly avoid scarifying the lawn in cold conditions.
It is normally best to scarify your lawn twice a year. Once at the beginning of the mowing season around March and April time, and again at the end around September before the winter cold sets in. This will ensure that adequate levels of thatch are left for the entire year.
In order for you to scarify /de-thatch your lawn successfully, you need the grass to be relatively short. Longer grass will require significantly more effort to dethatch and will take you longer to complete. It is recommended that you mow the lawn a couple of weeks before you plan to scarify the grass. Not only will this ensure the grass is a suitable length to dethatch, but it will minimise the stress on the grass.
Once you have removed the thatch and moss from your lawn it is important that you encourage the grass to grow. Where there have been areas of moss in your lawn, add a good quality moss killer to the grass to prevent it from returning. Add a good lawn fertiliser to the rest of your lawn to encourage the grass to grow and water for the next few days or as required. This will help the grass grow thicker and more quickly.