Scarify the lawn correctly
Lawn is the central element in most gardens. In order for it to be lush green, dense, hardwearing and resistant, you need optimal lawn care. This includes scarifying, which gives your lawn the proverbial air to breathe. We have compiled the best tips and tricks as well as practical instructions for scarifying for you in this blog post.
What is scarifying?
Scarifying means scoring the soil about three millimeters deep with a scarifier. This is also the difference to aerification, because aerification loosens the soil, i.e. aerates the lawn roots. Scarifying in turn ensures that the lawn plants are aerated. Cut grass that the lawn mower does not pick up and moss can matt the lawn over time. This lawn felt takes the space, light and nutrients that the grass plants need to survive. That is why this felt has to be removed regularly - preferably in spring and autumn. The main purpose of scarifying is to stimulate lawn growth and to keep the lawn healthy.
How do I know that I need to scarify my lawn?
You can tell whether your lawn should be scarified using various clues. The simplest test works as follows: Drag a small metal rake or a cultivator loosely through the grass. If mowing residues and moss cushions loosen, it is time to use the scarifier. Strong weed growth also indicates that your lawn should be scarified. Because weeds can usually deal better with the lack of nutrients caused by the lawn felt.
When should I scarify the lawn?
Scarifying is generally possible from March to September. It is crucial that the daily temperature is between 15 and 20 ° C, which is usually the case in spring and autumn. Scarifying should be avoided in summer, when the lawn is used intensively and gets a lot of heat - and in winter, when the ground is frozen.
Scarify in spring
In spring, the period between early March and late May is optimal. If you want to use your lawn intensively in the summer months, you should especially take care of the maintenance measures in spring. This means that your green has a few weeks of rest after the treatment - ideally three weeks. The earlier you scarify, the better - if the temperatures allow it as mentioned before. However, the past few years have shown that you should not wait too long with scarifying. May is often very warm and dry, that is why additional irrigation is necessary so that the sward closes quickly. There are two strategies for scarifying in spring:
- Strategy 1: Start lawn care directly with scarifying before the lawn begins to grow properly. The prerequisite for this is that the lawn was regularly mowed in autumn. After scarifying, fertilize the lawn and mow the lawn to normal height a week or two later.
- Strategy 2: Start lawn care with fertilizing. Then mow your lawn to normal height. As soon as the second lawn mowing is due - about 2 weeks later - it is the right time to scarify.
Scarify in autumn
Scarifying the lawn a second time a year should - if necessary - take place in the fall from mid-September to mid-October. Rule of thumb for the temperature: warm, but no longer hot. The second pass with the scarifier serves to remove moss, weeds and lawn felt, thus preparing the lawn for winter. You should choose the time of lawn care, here, too, so that the lawn still has time to recover from the exertions before winter rest.
Which scarifier is the right one?
Scarifiers differ in principle only in the drive. There are petrol scarifiers, cordless scarifiers and wired electric scarifiers. Regardless of this, the principle of operation is the same for all scarifiers: Surrounded by a housing made of metal or plastic, a spindle rotates, on which rigid or rotatable knives or hooks are arranged at short intervals. The knives and hooks cut the turf about two to three millimeters deep, removing dead material, moss and lawn felt. In this way, it helps the grasses and roots to a better air and light supply. Excess water can run off unhindered again. Electric and petrol-powered scarifiers usually throw out the turf that has been removed or collect it in a grass bag.
Petrol scarifier for larger areas
Petrol scarifiers are particularly recommended for large areas: they have no battery that needs to be charged and no cable that limits the radius of use and can be tripped over. They can work as long as the tank is filled with petrol. Another advantage of the petrol engine: it is heavy. This means that the petrol scarifier also has the necessary weight to push the knives deep enough into the turf. As a rule of thumb, petrol scarifiers are also more powerful than electric scarifiers. This is particularly advantageous on very dry soils, where they easily reach into the hard soil.
Electric and cordless scarifier for smaller, easily acessible areas
The performance of electric and cordless scarifiers is generally sufficient for the home garden. If you scarify your own garden only twice a year, you can also overlook the supposed flaw of the cable. If you want to be independent despite the electric motor, the cordless scarifier is suitable. This promises cordless freedom and, with the right battery pack, also similar performance to a petrol-powered device. Wired or with a battery - both versions impress with a lower noise level than the petrol scarifier.
Preparation for scarifying
To avoid unnecessary damage, you should only scarify when the lawn is dry. If the soil is too wet, the scarifier may also tear out healthy lawn plants. Mow the lawn to a height of two centimeters just before scarifying - this is usually the lowest setting of the lawnmower. Before moving on the scarifier, you should remove larger stones from the lawn. Otherwise these could be thrown up by the rotating roller of the scarifier and hit the device or in the worst case, you.
The right scarifying
First set the working depth correctly: Here applies the principle: "As flat as possible, as deep as necessary". The right depth for scarifying depends on the nature of the soil and the degree of matting of your lawn, which should be between 3 and 20 mm. Then move the device lengthways and then across the surface, creating a fine checkerboard pattern. Make sure that you move the device quickly over the surface and do not stand in one place for long, otherwise the turf will be damaged too much. When changing direction, push the guide bar down so that the blades hover over the lawn when turning.
Aftercare of the lawn
If your scarifier does not collect moss and felt in a grass catcher, rake it off the lawn thoroughly. The deeper you scarify, the more material the device releases from the ground and the more often the grass collector has to be emptied. Then it is more practical to work without a grass catcher and then collect the excess green waste with a rake.
Then sow bald spots directly with fresh lawn seeds. Sprinkle lawns on heavy, cohesive soil with a thin layer of construction sand to loosen up the soil and improve its air balance.
First of all, the lawn will look pretty "taken away". Proper fertilization helps it to recover. The fertilizer can quickly settle in the loosened soil and does not float away even in heavy rainfall.
In the following three weeks, you should regularly water the lawn sufficiently so that it can recover well and grow back vigorously. In addition, the lawn should be walked on as little as possible after scarifying, to quickly develop back into a lush green lawn.