Polyon fertilizer will save you time and money -- and it's great for your lawn, too. Polyon is a controlled-release nitrogen fertilizer that is triggered by a combination of moisture and soil temperature, predictably feeding your lawn's roots through osmotic diffusion when it requires nutrients the most. Its timed release means avoiding rapid growth and excess clippings. Further, one or two applications are often all your lawn will need for a full season, as rainfall and overwatering do not cause overly rapid release or washing away of active ingredients. Polyon's design makes it resistant to leaching; it consistently delivers vital nutrients right to your lawn's rootzone.