California Pest Rating for Spanish Mercury  |  Mercurialis ambigua Pest Rating: B  |  Proposed Seed Rating: R PEST RATING PROFILE Initiating Event: This plant has been rated as “B” on the CDFA Plant Pest Rating list for 3 years History & Status: Spanish mercury is a modest annual herb with alternate, oval leaves. It has tiny … Continue reading Spanish Mercury | Mercurialis ambigua →