Eradication of alyssum proves to be tough task

CAVE JUNCTION, Ore. – More than 20 years ago, it was touted as a miracle plant – a “hyperaccumulator” able to pull heavy metals, such as nickel, out of the area’s serpentine soil and store it in its leaves.

At least that’s what was told to then-county commissioners who approved planting of yellow-tuft alyssum on eight plots, totaling more than 50 acres in the Illinois Valley.

Now, the flowering invasive weed has traveled up and down the Illinois River and is considered a menace that’s keeping volunteers on their toes trying to control and eradicate the invasive, self-pollinating, perennial plant.

Volunteers Gordon Lyford, Scott Taylor and Wes Brown regularly pull and destroy alyssum plants that grow at the Illinois Valley Airport and other locations in southwest Josephine County.

The area is known for its bounty of beautiful native wildflowers, many of which are endangered by the invasive alyssum.

Lyford said there are many reasons to get rid of the plant.

“It’s a non-native, opportunist plant and will take over, not to mention, it is toxic to livestock. I’ve heard two bulls died from eating it,” he said.

The plants’ variation of heights when ready to drop seeds is one reason it is difficult to harvest or eradicate alyssum, said Larry Graves, Josephine County airport manager.

Alyssum is a member of the mustard family and native to Turkey and elsewhere along the Mediterranean coast. It was brought to Oregon by a company called Viridian Resources, which later declared bankruptcy and left the area, according to Graves.

Although many objected to the county’s decision to plant alyssum, a previous airport manager OK’d the plan, Lyford said.

Graves has been the county’s airport manager for the past four years and inherited the “unfortunate situation,” he said.

When he came on board, there were piles of the pulled plants that, according to Lyford, had been there for eight to 10 years.

“We burned (the stacked plants) four years ago in October. In the spring, there were alyssum germinated in the black ashes. They survived the fire,” Lyford said.

The county isn’t on its own, however, to eradicate alyssum.

The Oregon Department of Agriculture has taken the lead, coordinating the task force and performing helicopter surveys to locate patches and escapees, single plants that have strayed to neighboring locations, said Carri Pirosko, the region’s noxious weed coordinator for the Oregon Department of Agriculture.

An upcoming helicopter survey is planned in the Illinois Valley on June 16.

Pirosko said her department uses two methods to eradicate alyssum – manual volunteer efforts and with chemicals. Manually pulling and destroying the plants is the preferred method, she said.

Pirosko said an alyssum pulling party last week on private property near the airport yielded more than 600 of the plants.

Volunteers pulling the plants generally change shoes or boots upon entering and leaving the sites where alyssum grows, so as not to transport parts of the plants on their feet.

Though it is a daily struggle to destroy the weed, the escapees are the biggest problem, according to Lyford.

“The goal is to not have any seeds in the ground, but they just keep coming,” Lyford said.

“It’s like a big metal spring, we’ve pushed that spring down, but we can’t let it back up. We’ll declare it eradicated five years after you don’t find one plant. But, that five years hasn’t started yet,” he said.