Cappy did not mention cypress mulch somebody else did. I use hey, grass cuttings from the mower, leaves, pine needles etc. In short what ever is around. Ya aint gotta buy mulch. What mulch does is block sunlight but if ya use natural stuff it will also compost and hold moisture. It's main purpose is to kill grass close to teh tree that is dangerous to cut or weed eat. You can also use ground cover. like monkey grass or something edible like mint.
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