Repairing a waterlogged / flood damaged lawn
Recent flooding has left many lawns, including my own, in a very poor state. The grass has been starved of oxygen for many weeks and is now covered in a thick layer of silt. It’s going to need some help to recover.
Firstly, be patient and keep off the lawn until it has dried out; it’s very fragile in its current state and heavy boots will only cause further damage. Once it’s dry enough to walk on without squelching / sinking remove as much debris as possible and gently rake the layer of silt to break it up.
Normally, healthy soil is full of pockets of air, allowing roots and micro-organisms to breath. Flooding causes the air to float to the surface and then the excess weight crushes these pockets and the soil becomes compacted – stressing the grass even further. So a good mechanical aeration is needed, creating thousands of holes and getting air back into the root zone. If the flooding was short lived, then a light spring fertilizer will help to move the lawn on to recovery.
If the flooding was weeks rather than days, then more work will be needed. Post aeration, sorrel/slot seeder roll and add an over-seed, brush in, followed by a sand / soil top dress (4kg / sqm) to help drainage and seed germination. Keep moist for a few weeks whilst the fresh shoots establish, then gently mow, starting high after 4-6 weeks.
Follow these steps and the lawn will recover. Get in touch if you need any help or further advice.
Thanks & good luck
Thames Valley Lawncare