Lawn Care: Questions and Answers

Q. Is winter the right time to core aerate my lawn? I have had a company looking after the lawn as it’s quite large and there are quite a few trees around, moss was a big problem. They came yesterday and core-aerated it at a daft cost…and I notice none of the other neighbours had this process done ( those that use this company that is) and I just want to make sure they are not pulling the wool over my eyes ( they know I’m widowed..). I appreciate every garden is different, in it’s needs and issues, but just a general idea of when these processes should be done, would be helpful.

A. The generally accepted time to aerate the lawn is March to
November so I am a little surprised the contractors came in winter. Usually the
ground would be too hard to successfully aerate if they used a coring machine
as it is likely to just bounce across the surface.

The following is an extract
from the Royal Horticultural Society on aeration. The better time would be
March/April or September/October and if core plugs are removed the grass would
usually be top dressed with loam, sand and organic matter to fill the holes
left and aid the aeration to the grass roots as well as help drainage. This is
a process you would have done every three to four years.  If you
have  a lot of moss then drainage may be a problem and aeration will help
but also scarifying carefully with a rake can help remove thatch – the dead
grass and moss.

There is an organic moss killer and fertiliser called MO Bacter
that kills moss without leaving a black mess or the need to scarify. It is sold
in good garden centres or can be obtained from www.djturfcare.co.uk
telephone: 01483 200976.  It is hard to say whether the contractor is
pulling the wool since, as you say, conditions vary across the country, as does
type of soil (clay for example can be difficult) but it might be worth talking
to neighbours who use the same contractor for their views on why they didn’t
have their lawns done at the same time.

RHS extract:

Aerating (or spiking) lawns allows better movement of air and water in the root zone. A well-aerated lawn will manage better in periods of drought or waterlogging. For an average lawn, aeration every two to three years should be adequate. Concentrate on areas that receive the most wear and those that are compacted.


Small areas can be spiked with a garden fork, spacing holes 10-15cm (4-6in) apart and deep. On clay or waterlogged soils use a hollow-tine aerator every three to four years. This extracts plugs of soil from the lawn. Hand held and motorized hollow tiners are available. After hollow-tining, sweep up the plugs and then rake a top-dressing (see below) into the holes to improve air and moisture penetration.