Land Plants - invasive

Lesser Celandine (Ranunculus ficaria) on Mar 20, 2018

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

Yellow flowers, 9 or so petals, blooming right now. Please see photos. It sure looks like lesser celandine to me.
Spreading clump of lesser Celandine Closeup of portion of the clump Adjoining corner sign.    CLump is about ten feet Northwest of this corner Clump is between the yellow arrow and the blue bus stop pole

Commentary

Hi Marilyn,
Thanks for reporting this! Yes, it looks like lesser celandine. I've seen it in bloom in other locations as well. It's a hard plant to control. Included below is a useful link to a lesser celandine fact sheet from 4-County CWMA and a research paper from 2010.

https://4ccwma.files.wordpress.com/2018/02/ipm_18_lessercelandine-web.pdf

http://scnps.org/wp-content/uploads/2012/03/2010_Axtell_Celandine.pdf

Manual hand pulling is generally not recommended in riparian zones and wetlands unless dealing with an extremely small infestation (i.e., a few plants). Soil disturbance can increase its spread. Any tubers or bulblets you dig up should be put in a plastic garbage bag and disposed of in the trash (and not composted).

There are some recommendations in the fact sheet for herbicide application if that is an option you want to pursue, although since it's already in bloom it may be too late to spray. I've heard herbicide application offers mixed results...the waxy leaves make it hard for the herbicide to absorb and translocate. It's best to control infestations early on before they spread, as you are doing. Once celandine gets established, it's difficult to eradicate.

If you have any other questions, please let me know. Thanks!
Kind regards,

Tyler Pedersen
Tualatin SWCD

Tyler Pedersen
March 21, 2018, 8:41 a.m.