Evening Primrose (Oenothera biennis) | Triple 5 Plant Codex

# Evening Primrose (Oenothera biennis) | Triple 5 Plant Codex ## Identification Block - **Accepted Scientific Name:** *Oenothera biennis* - **Family:** Onagraceae - **Common Names:** Evening Primrose - **Scope Statement:** This page covers *Oenothera biennis* in the context of the Triple 5 Plant Codex for pasture weed management in TN/KY. ## Required Page Structure ### 1. Overview Evening Primrose is a native species often found in pasture systems in the Mid-South. It is classified under the Onagraceae family and is categorized as a weed, pasture, toxic. ### 6. Toxicity and Animal Interaction - **Toxicity Level:** Low - **Species Affected:** dogs, cats - **Exposure Scenarios:** Risks associated with low toxicity level, particularly for dogs, cats. ### 11. Homestead Decision Guidance **Monitor.** Decision based on low toxicity and non-invasive status. ### 12. Source Reference Appendix - [USDA PLANTS Profile](https://plants.usda.gov/home/search?query=Oenothera%20biennis) - [UT Extension - Weed Management](https://utextension.tennessee.edu/) - [UK Extension - Pasture Weeds](https://forages.ca.uky.edu/) ## Structured Data - **Title:** Evening Primrose (Oenothera biennis) | Triple 5 Plant Codex - **Slug:** evening-primrose - **Common Name:** Evening Primrose - **Scientific Name:** Oenothera biennis - **Family:** Onagraceae - **Categories:** weed, pasture, toxic - **Toxicity Level:** low - **Animals Affected:** dogs, cats - **Invasive Status:** non-invasive - **Native Status:** native