Photo: Irma Sophia

Is perilla leaf toxic?

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.

aces.edu - Perilla Mint: A Toxic Threat to Livestock

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Description

Perilla mint (Perilla frutescens)—also known as beefsteak plant or Chinese basil—is an annual, broadleaf weed 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 (figure 1). Perilla mint produces flower spikes that are usually approximately 6 inches long and contain many small white or purple flowers. Flowers often appear between July to September. Plants can be most easily identified by their purplish color on the undersides of leaves (figure 2) and their minty aroma when the leaves are crushed. Additionally, perilla mint is recognizable in winter months from dormant carcasses, which is also indicative of where future populations will likely emerge the following spring. This non-native species has a history in culinary, ornamental, and medicinal markets. Perilla mint has escaped cultivation and is highly adaptable in the Southeastern climate. The plants are often found in shaded or semi-shaded woodland understories and along fence lines, streams, and natural areas, including pastures and hayfields (figures 3 and 4). Populations are frequently found in disturbed, fertile areas around hay rings, feed lots, and barns (figure 5).

Threat

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. Depending on the amount consumed and/or animal susceptibility, death may occur within a couple days or in as little as a few hours. Little is known about the amount of perilla mint needed to cause detrimental effects in livestock, nor about the factors that make some cattle more susceptible to its toxicity than others. Nonetheless, plants are generally more toxic as they enter the reproductive phase of growth, which also coincides with periods of lower forage quality and quantity, as well as increasing temperatures. Consequently, it is during this time that livestock often congregate in shaded areas that may be infested with perilla mint, putting animals at a greater risk of consumption.

Control

Several herbicides are effective in controlling perilla mint. Preemergent options include herbicide active ingredients such as aminopyralid, dicamba, imazapic, and picloram (table 1). These treatments should be applied prior to seed germination, which can occur as early as late-April, depending on latitude or when soil temperatures are between 68°F and 77°F. For each of these preemergent options, rain is necessary following application in order to move herbicides into the soil. Postemergent herbicide choices include 2,4-D, aminopyralid, dicamba, glyphosate, and picloram (table 2). These treatment selections should be applied to emerged plants from seedling stage through the early reproductive stage for effective control. If opting for the use of postemergence herbicides, grazing livestock should be removed from the treated area until the plants are fully controlled to reduce the risk of consumption. Other control options include hand pulling or mowing, but these methods should be done prior to seed production. 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.

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What do Koreans use perilla leaves for?

mykoreankitchen.com - Korean Perilla Leaves

Learn about the popular Korean leafy vegetable – Korean perilla leaves!

What are Perilla Leaves

The Korean name for perilla leaves is “kkaenip” or “ggaenip” (깻잎).

In Korean cooking, perilla leaves are typically used in a pickled side dish, in stir fry, in soup and as a wrap. It is part of the mint family and has a strong aroma. It is similar to Japanese shiso, but it is known to have different flavors and shapes. Perilla leaves are commonly mistranslated as sesame leaves but they are from different plants. At a Korean grocery store (in Australia), you can get 1 bunch of perilla leaves (about 25 leaves) for AUD $2.50. If you can’t buy them easily, you can grow them from seeds too. It’s quite easy. I love them because they give a unique smell and taste to a dish and make everything so tasty. 🙂

How to Buy

Fresh perilla leaves are dark green in color and have a stronger scent. Also, the stems should not be dried and should have little fine hairs on the surface of the leaves. Lastly, try to avoid the leaves with red and/or black dots on the leaves as they have been stored with moisture for too long.

How to Store

In general, perilla leaves dry out easily. So to store, wrap the perilla leaves with kitchen paper then place them in a plastic zip lock bag. Refrigerate until needed, however, it is best to consume earlier for an optimal outcome.

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