Thatching
Thatch is dead grass and plant material that nature has not been able to break down. Instead, it has formed an impenetrable layer below the grass. When the thatch layer exceeds .2 inches, the water permeability of the soil decreases, the grass roots grow closer to the surface and the root mass and the oxygen exchange decrease. As a result the grass becomes less durable and can no longer withstand the foot traffic it once could. In addition, the risk of disease increases dramatically and some grass varieties can not survive. Thatch forms for a number of reasons, for example:
 

•	The use of modern, lab created grass varieties

•	The use of fertilizer with high acidity

•	Over fertilization

It is a good idea to Thatch when the grass is growing well, preferably in late spring or early autumn. Avoid Thatching in early spring or during dry periods, as you may stress your lawn. To remove the thatch layer you can use a variety of tools. Thatching machines with flail blades are a good tool. For more sensitive grasses, a Thatching machine with spring tines is recommended. A Thatching machine can also be used to cut the lateral roots of the grass and to fight broadleaf weeds. This is most effectively done with a delta blade. Your Husqvarna retailer can recommend the correct blade for your needs.

Deep aeration

Compacted soil makes it difficult for plants such as grass to develop. Compaction limits the movement of water through the soil and the ability of the roots to grow. The water surplus that develops creates a lack of oxygen in the ground, which is also not good for the plants. Compaction damage can affect new or existing lawns. Some causes are: constant vibrations from traffic in urban environments, the use of heavy vehicles when laying the lawn or by heavy foot traffic on the lawn.

How can the ground be loosened up?
Loosening up established vegetation areas such as grass areas is done by aeration. This is done with special spike or hollow tine aerators. A spike aerator simply punches a hole in the ground. A hollow tine aerator stamps out cylindrical holes in the earth, approximately 3 inches deep and brings the plug to the surface of the earth.

What are the advantages of aerating the grass areas?
 

•	Stronger root growth

•	Increased water permeability

•	The grass can better withstand dry weather conditions

•	Better root hydration

•	Use less weed killer

When should you aerate?
The grass should always be growing well before you start deep aeration. You should never aerate when the grass is not growing well or when it is stressed, such as during a dry period.