The Plant Growth Regulator (PGR) is an application of regulator and liquid feed, which must be applied together. The results of one application last for around 4 weeks.
This product will reduce the amount of grass clippings by up to a third, so three applications gives you three months of reduced clippings with the added benefit that the grass will thicken as it puts effort into lateral growth.
If you choose to incorporate this into your lawn care programme we would remove our early summer feed and apply the PGR instead. We recommend 3 applications over May, June and July.
This means that not only to do you have less grass clippings and less to compost; you will be left with a thicker, greener lawn and a little more time on your hands.