"Doug Kanter" wrote:

"Stephen M. Henning" wrote:
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.

Really? Even 5-6 feet away from the shrubs themselves?

It depends on the spread of needles or scales. The chemicals are
released from the needles or scales. If they get scattered around, then
the toxic effect is scattered around.

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