| http://www.w3.org/ns/prov#value | - The spraying likely will take place twice a year, in the spring and fall.Eventually, as the herbicides kill weeds and prevent weed seeds, parks workers may be able to reduce the herbicide spraying to once each year, Dickens estimated.Once the weeds are reduced, workers also can start using methods such as mulching and adding more plants to crowd out weeds, he said.Staff reporter Vickie Aldous can
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