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Thanks DanAB. I dont think there are any weeds as it is not even a year old so hopefully hasn't succumbed, but I want to keep it healthy.
How can I also improve drainage in one area?
I know we had a very wet winter - but one part of the lawn was very waterlogged and mushy for most of the winter and I know that can weaken the grass and cause disease?
Any ideas?
I'm all motivated now with the nice weather we had at the weekend to get out and do some gardening!!