Invasive Plant Found
in Alaska
October 14, 2005 — By Associated Press
ANCHORAGE, Alaska — An invasive plant
that could overrun wetlands such as Potter Marsh and block salmon runs
on the Kenai Peninsula has been found growing wild in Anchorage for the
first time.
Purple loosestrife is growing along Chester Creek, plant scientists
said. The plant, which resembles fireweed, has already choked creeks and
wetlands across the Lower 48 and Canada.
The hardy flowering perennial is native to Europe and can multiply into
dense thickets almost impossible to eliminate.
"This is a really horrific wetland invader, pretty much across North
America," said Jamie Snyder, invasive plant specialist with the
University of Alaska Fairbanks Cooperative Extension Service, in
Anchorage.
Its pepper-sized seeds are carried on feathers and fur.
"So it's just one hop away from Potter Marsh, and then it's just one hop
away from the Kenai Peninsula, where fishing industry is huge," Snyder
said.
"This plant, if it were to get established in Potter Marsh, would
absolutely cover the marsh," said Michael Shephard, plant ecologist with
the state and private forestry office of the U.S. Forest Service. "There
would be no more geese, no ducks, no terns, no swans."
Purple loosestrife has long been planted by local gardeners who thought
it could not spread. The purple flower is listed as a noxious plant in
several states and Canadian provinces. It drives out native plants,
overgrows wetlands, ruins fish passage and blocks access from the bank
for recreation.
The plants can take root from cuttings or spread in place through the
ground.
"This one is like the Top Gun as far as prolific seeders go," said
Michael Rasy, a pest control specialist with the extension service.
Snyder and Shephard plan to carefully dig out the plants along Chester
Creek.
The varieties sold in nurseries were supposed to be sterile, or the
Anchorage growing season was thought too short to allow it to seed and
spread, said Julie Riley, horticultural agent with the extension
service.
In 1997, Riley argued it should no longer be planted in Anchorage. But
the consensus was that no one had ever seen it outside a tended bed.
"Because it hadn't had a history of escaping at that time, it was just
kind of on everybody's watch list," Riley said.
"We didn't think we had a problem, but we do," said Jeff Lowenfels, an
Anchorage businessman and gardening columnist. "If you have any growing
in your garden, pull it up and throw it away.
Alaska already has more than 20 invasive weeds spreading along roads and
trails, several originally planted as garden plants or flowers.
Purple loosestrife first appeared on the East Coast in the early 1800s
and slowly spread. By the 1930s, it began taking over wetlands and creek
bottoms.
Source: Associated Press |