Spot It Right: Noxious Plants Awareness

Yes. Under the Canada Labour Code, Part II, federally regulated employers must identify and control all workplace hazards, including hazardous plants. Provincial OHS legislation - such as Ontario's Occupational Health and Safety Act and Alberta's OHS Act - extends the same obligation to virtually every Canadian workplace. Employers must conduct seasonal hazard assessments, provide PPE at no cost to workers, post warnings in known hazard areas, and deliver plant identification training before workers enter potentially affected sites. In Ontario, Giant Hogweed is also a prohibited invasive species under the Invasive Species Act, 2015, making it illegal to transport or distribute the plant and exposing employers to fines up to $25,000 for non-compliance.

Giant Hogweed grows 2 to 5 metres tall - often taller than a person - with thick, hollow, ridged stems that have distinctive reddish-purple blotches and coarse white hairs. Its deeply incised leaves can reach 1.5 metres wide, and it produces large umbrella-shaped white flower clusters up to 50 cm across in June and July. The reddish-purple stem blotches are the key identifier: the similar-looking native Cow Parsnip is shorter (1–2 m), lacks purple markings, and causes only mild reactions in sensitive individuals. Even dead Giant Hogweed stems can contain active sap for weeks, so treat any large dead stalk with the same caution as a live plant.

Wash the exposed area with soap and cool water for 10 to 15 minutes right away - cool water matters because warm or hot water opens pores and increases sap absorption. After washing, cover the exposed skin completely for at least 48 hours because the sap's furocoumarin chemicals are activated by UV light, and sunscreen alone does not block the UV wavelengths involved. If sap contacts your eyes, go to emergency immediately and flush continuously with clean water en route, as Hogweed sap can cause temporary or permanent blindness. Under provincial OHS legislation, employers must have a written first aid procedure for sap exposure as part of any safe work procedure in areas where these plants are present.

Workers need heavy-duty chemical-resistant waterproof gloves (nitrile or neoprene) that extend over sleeve cuffs, plus safety goggles or a full face shield - standard safety glasses with open sides are not sufficient because sap can splash from any direction. Clothing must be long-sleeved, full-length, and made from waterproof or water-resistant synthetic fabric; cotton absorbs sap and holds it against the skin, making exposure worse. Tall waterproof rubber boots with pants legs tucked in and secured complete the minimum kit. Under Alberta's OHS Code Part 18 and BC's OHS Regulation Part 8 - and equivalent rules in other provinces - employers must provide all required PPE at no cost to the worker.

Yes. The right to refuse unsafe work is protected under Canada Labour Code Part II, Section 128 and equivalent provincial OHS acts across the country. If a worker reasonably believes that working in an area with uncontrolled Giant Hogweed exposure poses an immediate and serious risk, they can refuse that work and cannot be disciplined or dismissed for doing so. The employer's obligation is to address the hazard - completing a hazard assessment, implementing controls from the Hierarchy of Controls, and providing appropriate PPE - before directing workers back into the affected area. Workers also have the duty to report any suspected noxious plant sighting to their supervisor immediately rather than attempting removal on their own.