The greens here at CMGC have had a scarify, and what a difference it has made.

The scarifying is done to improve air circulation, reduce thatch, and promote healthy turf growth.

Reduce thatch buildup: Thatch is a layer of dead and living plant material that can harbor diseases and pests. Scarifying helps break up this layer.
Improve air circulation: By removing thatch and debris, scarifying allows for better air movement through the turf, reducing the risk of disease.
Enhance drainage: Scarifying helps water penetrate the soil more easily, reducing puddling and improving playing conditions.
Promote healthy growth: By removing dead material and improving air and water circulation, scarifying encourages healthy turf growth.
The greens have been rolled, and it is amazing how firm the surface is after doing this.

Next week, the coring and top dressing process will start. The plan (weather permitting) is to do one nine over the next 18 days. This will mean that there will always been 9 to 18 holes that have recovered and minimize disruption.

Coring:

Involves removing small plugs of soil and grass to alleviate soil compaction
Improves air, water, and nutrient exchange in the root zone
Helps reduce thatch and promotes healthy root growth
Top Dressing:

Applies a thin layer of material (usually sand or a sand-based mix) to the golf green surface
Smooths out imperfections, improves drainage, and enhances playing conditions
There is never a good time to do this work. However, whilst there is plenty of growth and warmer soil temperature,s the recovery process will be quicker.