Veterinary Services

It's the time of year where Perilla Mint is pretty much everywhere.

Perilla mint (Perilla frutescens)—also known as beefsteak plant or Chinese basil—is an annual, broadleaf w**d originally from eastern Asia. Plants commonly reach an average height of 2 ft and can be identified by their coarsely serrated leaf edges, which occur opposite each other along a square stem.

Perilla mint is highly toxic when consumed by cattle, other ruminants, and horses. The entirety of the plant is toxic, with the flowering structures being especially potent. Perilla mint is more likely to be consumed in the fall, because of a seasonal decrease in forage availability.

Perilla ketones are one of several volatile compounds found within the plant that cause atypical interstitial pneumonia (AIP) in cattle and other domestic animals when ingested. Fluid accumulates in the animals’ lungs, causing reduced oxygen levels and shortness of breath.

Since perilla mint is a prolific seed producer, growers are encouraged to be diligent in control practices as plants will likely occur in subsequent years from single populations. When using herbicides for control, be aware of any desirable species that may be nearby, and always read and follow all label recommendations.

No animal is too big or too small, except for snakes, Dr. Weseli sees them all!