I first started using them 2 to 3 years ago for lawn maintenance because I had an outfit I was very dissatisfied with, they lied to me and overcharged me. They come every month and a half. It is fine. They control the weeds, the insects, all of the lawn insects. I had some Lugustrom trees that are really not appropriate. The location was a little too moist. The humidity where I put them turned out to be a bad place. Lugustrom trees don't like moisture. I was having trouble with fungus. They would spray it. They recommended I changed them to hedges. That recommendation turned out good. Anytime I had some lawn fungus, they would come out and make a free visit to treat the fungus. You get lawn fungus from time to time. I have a guy that cuts my grass and the blades on his mower could have the fungus on it. He could bring that in from somewhere else, or it could be the lawn was a little too wet or something.