It will soon be illegal in Washington to buy or sell English ivy, the fast-growing, climbing vine that can weaken and kill trees and overtake native plants.

The Washington State Department of Agriculture, earlier this month, added 19 species, including English ivy and Atlantic or Boston ivy, to its noxious weed, seed, and plant quarantine list.

Under state law, all species on the list cannot be transported, bought, sold or distributed in Washington. Anyone who does have a plant on the list is required to destroy or dispose of it in a way that prevents its spread.

The Department of Agriculture began the process of adding plants to the list in May after receiving multiple petitions from members of the public. 

“Initiating quarantines for these plants, forbidding entry or distribution of them gives a critical tool to control and prevent infestation,” the Department of Agriculture wrote in an explanatory statement that accompanied the update of the list. 

Public comment ran from May 7 to June 24, and the proposal was finalized on July 9 and it takes effect Aug. 9

Feedback from the public and local stakeholders, including weed boards and other state-level organizations, overwhelmingly supported adding the 19 species to the quarantine list, according to the Department of Agriculture. 

Support for the inclusion of English ivy was especially strong, the agency said. 

In addition to shading out tree foliage, ivy can add weight to trees, increasing the risk of wind damage. It can also result in bark damage, making trees more susceptible to insects and disease. When the vine spreads on the ground, it can crowd out native plants.

English ivy has been classified as a Class C noxious weed in Washington since 2002, but that classification only allows individual counties to enforce control of the plant if they choose to, and doesn’t place any statewide limits on its distribution. 

“People really got involved and really communicated how much they value the trees and how destructive this particular plant was to those trees,” said Susan Hutton, executive director of the Whatcom Million Trees Project, a nonprofit that works to protect and plant trees in Whatcom County. 

Hutton’s predecessor at Whatcom Million Trees Project was among the petitioners who started asking the Department of Agriculture to add English ivy to the quarantine list a couple of years ago. 

Other groups that supported adding English ivy to the quarantine list were the Bainbridge Island Land Trust, Edmonds Stewards, the King County Noxious Weed Control Program, Birds Connect Seattle and the 10,000 Years Institute. 

“It’s a long legislative process to get on that list,” Hutton said. “It’s a huge win for us, and we’re thrilled.”

Whatcom Million Trees Project hosts English ivy removal work parties and provides free resources on its website for people looking to remove the invasive plant on their own.  

Public commenters voiced support for adding other plants to the quarantine list, including English holly, English laurel, and Himalayan blackberry. Those plants were not included in the update. 

The Department of Agriculture said that “while these suggestions were considered, some species could not be added due to regulatory, scientific, or procedural limitations, or simply because they are not currently available for sale in Washington state.”

Correction 7/17/25: This story was updated to reflect that the ban on English ivy sales does not take effect until Aug. 9, 2025.