This mixture of different lengths is the best thing for the environment outside of No Mow May because it gives different insects different advantages, creating a mixture of wildlife far removed from stale monocultures.

...

Insect populations are down by as much as 60 to 80 percent in the UK in the past 20 years, according to studies, so anything we can do in our gardens to give them a helping hand is much needed for the future of food security and key pollinators in the food chain.

Personally I think the last part has little to do with cities and more to do with what must be pesticides in farming.

No mow may, it's the equivalent of inviting guests and kicking them out as soon as their bags are unpacked.

I already do this but mostly I just hate the trim work. Give the bugs the borders and they seem to leave me alone.

I'm glad some municipalities in the Netherlands started doing this a few years ago. Near intersections they cut it short so people can see other cars and bicyclists approaching. But near the woods and not near intersections they let it grow for a while and don't cut it to the ground.