Andrew,
If you have Himalayan blackberries, the canes will get much taller
and reproduce as the tips of trailing canes hit the ground. An escape
from garden plants imported in 1885, it is considered a noxious weed
in the Pacific Northwest. What part of the country are you in?
A good description and history from a professor at Oregon State
University can be found at:
<http://www.ars-grin.gov/ars/PacWest/Corvallis/ncgr/cool/rub.aliens.html
News from California is at:
<http://www.nps.gov/archive/seki/snrm/nnp/html/badrudi.htm>
A noxious weed alert from King County, Washington, is at:
<http://www.kingcounty.gov/environment/animalsAndPlants/noxious-weeds/weed-identification/blackberry.aspx
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