I was recently asked by a client how to get rid of ants in the lawn. I have to admit that this is a difficult subject to tackle. A plague of ants in the lawn can be uncomfortable at best and at worst will destroy the lawn by creating mounds of finely tilled earth that can kill the grass.
There are proprietary branded products on the market that are supposedly good at killing ants, but from experience they have no use in the lawn as the ants do not take them back to the nest, which is what needs to happen in order to stop this problem. An old wives tale states that boiling water poured onto the nest will do the trick, but to be honest if you want a scorched lawn and a more visible ant’s nest, then this is the path for you. The problem here is the nest will be deep underground so the trick is to upset the natural balance.
Personally, I have found that the best action is a multiple approach.
The first approach is to buy a besom or a Town and Country stiff brush and just brush the mounds away; making sure the soil is dry first of course. If the soil is wet, you get an ugly smear so best wait, or instead hose the mound away. The idea here is the ants do not like to be disturbed and you will give the local jays and robins some food into the bargain.
The second phase, given the British weather is usually damp, is to dress the nest with a mixture of Armillotox and water from a watering can (follow the instructions carefully). The scent will put the ants off the lawn altogether as they communicate by chemical smell, but this may take a summer of repeat treatment to work.
Finally, there is the ultimate solution. Buy borax powder from the hardware shop and mix it with a sugar solution, making sure it is not entirely dissolved. (A sugar solution is basically a cup of water mixed with two table spoons of sugar). Place the mixture next to the nests in a small open container. The worker ants will take the concoction deep into the nest and will unwittingly poison their sisters. If the sugar solution proves too hard, mix the borax with honey. Please be aware, when dealing with poisons, be sure to wear suitable clothing and to make sure it is safe from harming others - children and pets should be kept away from the areas.
If all goes well the ant problem will disappear never to return.
- Guy Deakins