UPDATE: 2015: They have called me a couple times trying to get me to redo the service and I ask for 12 months spraying, they say they can, and then in the course of the conversation, they try to baffle you with less numbers and multiple lawn and tree spraying so it comes out to 12, etc., I finally told the guy no, and blocked the number. Cost is very high, since it's not a lawn, just weed spraying, compared to other services we have had with full lawns and trees.
After I placed my review here on YELP, I got a call from the "new" office manager, with promises of big changes and people had been replaced, etc.
A few days later they came out to the see my yard, where the dog kennel was, etc. Yes they could take care of the grasses, they couldn't.
Today I cancelled the yard spraying. I have a mostly rock yard with a few plants. And a few weeds.
I don't want to call them every other week when we have a drop of rain in LV because that's when the weeds start.
I have lived in 3 different states using TruGreen, they all came monthly. Don't know why they won't do it here in the desert.