06/05/2026
AG PRODUCER ALERT: Poison Hemlock Risk in Hay
With hay season underway, be on the lookout for Poison Hemlock creeping into fields and hay bales. This plant is highly toxic to livestock—even in small amounts—and drying in hay does NOT remove its toxicity.
• Poison hemlock contains toxic alkaloids that affect the nervous system
• Animals may accidentally consume it when it’s baled into hay
• Symptoms can include tremors, weakness, difficulty breathing, and sudden death
How to Identify:
• Tall plant (up to 6–10 ft)
• Hollow stems with purple spots/blotches
• White, umbrella-shaped flowers (similar to Queen Anne’s lace)
• Musty or mouse-like odor when crushed
Management tips:
• Scout hay fields before cutting
• Remove or control plants before they mature
• Avoid baling contaminated areas
One overlooked patch can turn into a serious livestock loss. Take the time to check fields now—it could save you major headaches later.
Each plant can make as many as 38,000 seed that can persist in the soil for 3-5 years
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https://www.howellcountynews.com/agriculture/mow-or-spot-spray-poison-hemlock-now
ID - https://weedid.missouri.edu/weedinfo.cfm?weed_id=69