The discovery of an invasive vine in Maine has alarmed state officials who keep an eye out for non-native species. It’s called the mile-a-minute vine, and despite the name, it doesn’t grow 60 miles in one hour. But it can grow up to six inches in a day.
It’s just one of many features that have enabled it to become established in the mid-Atlantic and southern New England — and identified in Maine. But there are efforts to keep it at bay.
On a recent August morning, Mark and Katie Potvin were walking on several parcels of land on a quiet road in Seabrook, New Hampshire.
Along for the hike was New Hampshire invasive species expert Doug Cygan, who has spotted a mile-a-minute plant in the brush next to the road.
Cygan grabbed the head of the vine and noted its triangular leaves, a thorny stem and bright, blue berries.
“When you know what you’re looking for, you know what you’re looking for,” Katie Potvin said.
Before this sighting, mile-a-minute vine had been found in only five locations in New Hampshire, four of which are on the Potvin’s property. Its presence is closely monitored, because the invasive mile-a-minute vine can get out of control, quickly.
“It can grow six inches a day,” said Gary Fish, a horticulturist with the Maine Department of Agriculture, Conservation and Forestry.
Fish said that mile-a-minute vine is very aggressive in staking out its territory, and will use its weight to drag down other plants.
“It will vine around plants, and it will also climb up plants,” Fish said. “It is reminiscent of a lot of the vines that are out there that will cover plants over and basically outcompete those plants.”
The mile-a-minute vine is native to Asia and is believed to have first been found at a Pennsylvania nursery in 1946. It can hitch a ride on nursery plants, which earned it a spot on Maine’s “do not sell” list of plants. Its seeds are also spread by human activity and birds.
The invasive vine was first found in Maine in August by a resident of Boothbay Harbor. And after the Department of Agriculture publicly announced the discovery, people took notice.
“We’ve gotten many people saying, ‘Oh, I’ve had this in my yard for years. I’ve been pulling it up all summer,’” said Lisa St. Hilaire, who works with Maine’s natural areas program.
St. Hilaire said there were about 150 reported sightings after the Boothbay Harbor discovery was announced. But only two of those actually were confirmed to be the invasive mile-a-minute vine. That’s because it has many lookalikes.
St. Hilaire said she got so many emails, her department came up with an identification chart to help citizen scientists know what to look for.
Back in New Hampshire, Doug Cygan was scouting around the Potvin’s property, pulling long ropes of the mile-a-minute vine out of the foliage.
Cygan said while it’s concerning to find the invasive vine here, there is evidence that it can be controlled.
The invasive vine was found in the central region of New Hampshire in 2008, but was successfully eradicated using spot herbicide application. Cygan hasn’t seen any new mile-a-minute plants there in the last 15 years — which he hopes means it’s contained to these few spots in the Seacoast region.
“Things, you know, may occur here, we just haven’t found them yet. Everything is definitely reliant on discovery,” Cygan said.
And discovery, Cygan said, depends in part on the willingness of landowners to notify the state, when they find the mile-a-minute vine on their property.
This article appears through a media partnership with Maine Public.
