If your soil is compacted or heavy clay soil, aerating twice per year is suggested. Regular removal of thatch is recommended to avoid layer more than 1 in thick. A good hard raking will often do just that without harming the root systems. Healthy grass will recycle thatch and convert it back into its life cycle. Encourage earthworms as they provide much needed root system aeration, provide nutrients from their castings and convert in soluble minerals into ready available minerals.
Earthworms are basic part of a organic lawn and also reduces thatch problems.
2.Topdress twice per year with screened or well raked in compost. 3.Apply rock dust twice per year in early spring and early fall. Weeds growing in your lawn can be a good thing, they attract beneficial insects to the garden. Weeds with deep roots break up compacted soil and bring nutrients to the surface and make it available to other plants. So decide if you want a few weeds or not.