Do you have any advice for controlling lesser celandine in forested watersheds? Its becoming a problem up her in SW Portland (Arnold creek, Tryon creek). It might make a great research project for PhD candidates. I've done some research online, and haven't found a good way to control it.
Multnomah County Oregon lesser celandine
Thank you for your question. If your research looks for articles that are research-based, limiting the search to the ‘.edu’ domain will get you to university sources. The PhD community, as well as such organizations such as Invasives.org, and the cities of Seattle and Portland, are actively working to find solutions to this problem. Here is an 8-year old study on the topic: https://weedecology.css.cornell.edu/pubs/Published%20Axtell%20et%20al.%20IPSM%203%20190-196%202010.pdf Unfortunately, elbow grease: repeat, seems to be the best long-term solution, but this resource has one wetland chemical resource: https://delawareinvasives.net/yahoo_site_admin/assets/docs/lessercelandine.307115505.pdf For some reason, OSU does not list it in its weed management handbook, although they do list a different buttercup variety: https://pnwhandbooks.org/weed/problem-weeds/buttercup-creeping-ranunculus-repens I hope these are helpful. Goos luck!