Is 'No Mow May' anything more than alliteration?

Quite a few 'No Mow May' stories in the press, eg "

Urgent call to Staffordshire residents to help protect pollinators and local biodiversity

But does an unmowed lawn make a significant difference to pollinators? About 10% of UK land is urban, and taking London as the example, about 50% is green space. At a guess, and assuming all green space qualifies as No Mow, the total will be about 5% of all  UK land.

Hmmm.