California Pest Rating for European Frogbit | Hydrocharis morsus-ranae L. Pest Rating: A |  Proposed Seed Rating: P PEST RATING PROFILE Initiating Event: This plant has been rated as “A” on the CDFA Plant Pest Rating list. History & Status: European frogbit is an annual herbaceous aquatic plant native to Europe. European frog-bit is generally free-floating but … Continue reading European Frogbit | Hydrocharis morsus-ranae L. →