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How does one deal with Conium maculatum (poison hemlock)?
Poison Hemlock (Conium maculatum) is an invasive poisonous plant found in parts of southern BC, including the greater Victoria area. It grows 1-3 metres tall, has fern-like leaves, umbrella clusters of small white flowers, and purple spots or streaks on its stems. Be cautious with this plant as it is very toxic – avoid skin contact or ingestion.
Avoid movement of soil to prevent the spread of Poison Hemlock. Small numbers of plants can be removed by digging up plants and removing as much root system as possible. Do not compost or put in green waste. Place in garbage bags, mark “invasive species”, and drop off at Hartland Landfill. Wear gloves, cover skin (e.g., long sleeve shirt and pants, and eye protection) when digging, removing or handling. Avoid mowing or burning. For larger infestations, report to the CRD and seek help from professionals. If possible, remove prior to seed development. Mulch after removal and replant area with appropriate plant species to suppress regrowth.
If someone ingests poison hemlock contact the BC Poison Control Centre (1-800-567-8911).
Sources:
A Guide to Weeds in British Columbia, BC Ministry of Agriculture, Food and Fisheries, pp.126-127: GTWIBC 1/5 Prelims v4-6 (gov.bc.ca) (accessed September 24, 2023).
Poison Hemlock Invasive Species Alert Sheet, Capital Region Invasive Species Program: poison_hemlock__factsheet_v5.pdf (crd.bc.ca) (accessed September 24, 2023).
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