"Doug Kanter" wrote:

At my apartment complex, there are long
stretches of flower beds where the only thing growing is the usual generic
evergreens.

Many of these "generic" evergreens shed needles (or scales) that are
preemergence herbicides and prevent weeds from coming up from seed. One
good examples is juniper Virginianis. That is why some forests have few
weeds on the forest floor.

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