While thatch is a necessary, natural and beneficial part of all lawn, it becomes a real problem when it increases to excessive amounts. This then has many detrimental effects to the lawn and must be dealt with effectively to remove the problem.
There are several methods used to de-thatch lawns and with a little understanding of each process - we should be able to choose the method best suited to our own lawns.
This method of detaching is best suited ONLY for warm season grasses which have runners, and is most suitable for the grasses which have underground runners called Rhizomes, this includes lawns such as Couch which can easily repair from the low cutting.
Low cutting involves mowing at a very low height to remove the entire thatch layer. This can be done with one single mowing, or may more easily be done with several passes being used - each time lowering the mowing height until all the thatch is removed.
This method can be very slow and dirty, and will produce an enormous amount of waste matter which must be considered and planned for before work begins. Overall, it has no benefits over Vertimowing, is not suitable for Cool Season grasses, and for lawns mowed with a Cylinder Mower a far greater result will be gained from Vertimowing.
Lawn coring is done with a lawn coring machine which is taken over a lawn's surface, and punches out plugs of soil, thatch and grass, leaving hundreds or thousands of holes in the lawn and soil surface.
Lawn coring is primarily done for the purpose of increasing drainage and aeration of the lawn soil. However it also has the added benefit of removing some of the thatch layer of the lawn. Lawn coring should only be used as a supplemental method of de-thatching as it is not overly effective, and will have little effect on heavily thatched turfs.
he best use for Lawn Coring as a method of de-thatching is for Cool Season grasses which have no runners to regenerate from which make them unsuitable for other de-thatching methods. Cool Season grasses will benefit greatly from lawn coring on a yearly basis which will routinely aerate the soil as well as regularly removing and controlling thatch.
Vertimowing really is the best method of de-thatching. Special machines are taken over the lawns surface to remove the entire thatch layer, including most of the lawn. The lawn is then left to regenerate from it's above ground and below ground runners. Apart from being the overall best method of de-thatching, Vertimowing is really the only method which should be considered when our lawns are mowed with Cylinder Lawn Mowers, as it removes the most amount of thatch, and slightly levels the soil surface - both things which Cylinder Lawn Mowing will benefit the greatest from
The process of Vertimowing is a very dirty job which is highly laborious and produces a lot of waste material. For these reasons, it really is best to hire a professional contractor to do the work for us, and to be assured to work is done properly and at a single session.