Scarifying is the process of mechanically removing thatch and moss from a lawn surface. If done correctly, your lawn should look in quite a bad state as scarifying is a very aggressive process. The surface of the lawn is machined by vertical rotating blades that not only rake out moss, but also dislodge thatch, and if done deep enough, it encourages tillering which is the production of new grass shoots from cut rhizomes' (vegetative reproduction).
Number of Treatments: Typically, once a year every 1 to 2 years.
Time of year: September through to November Spring and Autumn (can also in March/April).
The benefits are:
- Improved surface quality, by clearing out dead grass material and removing moss & creates good growing conditions
- The best advantage is gained from scarifying when the lawn is reseeded afterward. This will really turn a tiered lawn around.
- Breaks up the surface allowing water and nutrients to better penetrate when grass seed is reintroduced.
- A fine-bladed lawn often becomes very dense with age. Single-pass scarification thins the sward and rejuvenates the lawn, especially if it is aerated and fed at the same time.
The disadvantages' are:
- Dense layers of moss on lawns require it to be scarified in several directions.
- Poor visual appearance for some time after.
- A large amount of debris produced that needs to be disposed of.