As we know how to dedicate ourselves frequently to this operation it is important to stimulate the growth and the preparation of small plants, in addition to limiting the spread of weeds; at the end of winter it is also important to free the surface from the residues of the cold season (yellowed stems, dry leaves, twigs) and to stimulate vegetative restart. We recommend resuming these operations as soon as the height has reached 5 cm. The first interventions, however, must not be too drastic: we leave the mower high enough and remove at most 1/3 of the height. In this season it is very important to collect the waste: the soil will be freer and receive more light, water and heat. In this period we will cut on average once a week, to intensify in April-May, when it is good to intervene every 3 days.
Maintenance and regeneration
After the winter it can happen that the coat is not homogeneous due to the frost or to the persistent humidity. To quickly improve the situation it is good to act by removing the felt and fertilizing abundantly with a nitrogenous product (ideal is about 10 g / m2 of ammonium nitrate). The clayey and compact substrates benefit enormously from forking and, in extreme cases, from coring (reaching about 30 cm in depth). These processes help to aerate the soil and promote the penetration of water and nutrients.
However, it may happen that some areas continue to be thinned or yellowed: it is not necessary to completely redo the turf. We will simply hoe the surface and distribute a mixture of specific seeds. They must then be covered with a light layer of soil or sand, to be well pressed. We lightly, but frequently. We wait for germination and reach at least 4 cm in height to proceed with the first cut.
Remove the moss
At the end of the winter the moss is a very common problem. It spreads more in the shady areas, especially in the presence of humid climate and soil with an alkaline reaction, therefore clayey or calcareous. Eliminating it is not difficult: just distribute about 2 handfuls / sq.m of iron sulphate in granules (or dissolved previously in water. The moss will quickly turn to red and then dry. At that point it is important to distribute with a granular nitrogen fertilizer and make frequent cuts to favor the coating, the coat will soon be compact and the color very lively.
The lawn in March: Adversity
It is not uncommon for phytosanitary problems to occur at the end of winter, mainly due to rot and cryptogams. The Microdochium nivale is frequent: it manifests itself with the appearance of small redness and then thinning of about 20 cm of diameter. The so-called "witch circles" are instead caused by a large number of different cryptogams.
Unfortunately for both conditions it is not possible curative intervention. It is sufficient to simply remove the area (taking care not to remove the felt, an important means of diffusion) and proceed with a new sowing (as indicated above). To counteract the expansion it is important to keep the seedlings healthy by administering ternary fertilizers with a certain frequency, preferring those with a good potassium supply.