About local annual weeds
Desert Broom, Palo Verde Trees, Rag Weed, Casia Bushes, Bermuda Grass, and Nut Grass are some examples of perennial weeds in Central Arizona which may grow from seed but cannot be prevented with pre-emergent. Therefore, it is not uncommon to see such weeds emerge throughout the year after a pre-emergent application. This is not a sign of an ineffective application or breakdown of pre-emergent. See images below of such perennial weeds in your Arizona yard.
Spotted Spurge in Arizona
Common Purslane in Arizona
Annual weed problems?
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