• Over fertilisation and watering - this increases the grasses growth making it grow faster than the grasses ability to break down thatch
• Cutting the grass too high
• Heavy clay soil
• Over use of pesticides and fungicides that kill or impede the growth of soil microbes and earthworms
1. By touch - if your lawn is extremely bouncy underfoot then you are likely to have a thick layer of thatch on your lawn.
2. By sight - you should be able to see the soil between the grass blades. If you can’t, and you cannot poke your finger through the grass to see the soil you are likely to have a thick layer of thatch.
3. Measurement – a simple way to tell the level of thatch on your lawn is to dig up a small section of the lawn using a trowel about 3 inches thick. Look at the turf sample and look for the layer of thatch that is sitting on top of the grass / soil. If it’s 1.5cm or greater it is time to dethatch your lawn.