The last two or three years I have grown lawn areas for ease of maintenance and to collect rich biomass for feeding biology and making compost. Regularly harvesting grass results in a loss of broad leaf diversity, so this year is a no mow season, which means I only cut one or two amenity lawns and access paths , the rest is left to make hay and regenerate. It looks a bit messy and is so tempting to give a little trim, but not before mid June .
One interesting thing to try , which isn't always successful, still worth a go, is to sow a cover crop into the grass /hay just a couple of days before scything or strumming. It depends on the weather and being able to spread the hay on top evenly as it dries, so it becomes a mulch.