The local tree-trimmers are busy in town, and they have a chipper/shredder in action. I can take the pick-up truck into town and get a truckload of the material for free. The problem is, I don't know what is in it, how "green" it is, and if I want to introduce this into my beloved garden soil. I am torn because I need an incredible amount of mulch and "free" is a big attraction (told you I was frugal/cheap!). What is your experience with municipal mulch? Do you use it on the vegetables, or only on ornamentals?