A formidable invasive plant capable of reaching 15ft is making a comeback in parts of the UK as gardens are being cleared for spring – prompting fresh warnings ahead of its peak growth in May.
Giant hogweed is reemerging, and has dangerous implications, with its rapid seasonal surge expected to accelerate in the coming weeks.
Authorities have issued fresh warnings to highlight the plant’s toxic sap, which can cause severe skin burns when exposed to sunlight, warning that a combination of hot weather and an increase in Garden design Work makes this period one of the most dangerous times of the year.
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Why is giant hogweed growing now?
Giant hogweed survives the winter underground and starts growing again in early spring. By April, new shoots emerge from long-established root systems and seed banks in the soil.
This RHS states that “in its early growth it can be confused with other plants such as cow parsley and common hogweed.”
Although the plants are still relatively small at this stage, growth accelerates as temperatures rise. Japanese Knotweed But by May, giant hogweed can grow rapidly and become very visible in affected areas, especially in disturbed or overgrown areas.
Where UK homeowners are most at risk
The highest concentrations of sightings are usually associated with river valleys and low-lying waterways, where seeds are carried downstream and settle on banks before spreading outward.
In the UK, high risk areas include:
- River corridors in southern England, the Midlands and Wales
- Waterways pass through urban areas such as London, Birmingham and Manchester
- Fringe rural areas where railway embankments or gardens on uncultivated land
The most at-risk orchards typically border rivers, canals, or overgrown public land, where seeds can easily penetrate from surrounding areas.
What giant hogweed warnings are being issued for May
This Department for Environment, Food and Rural Affairs (DEFRA) advises homeowners that giant hogweed should be treated with caution during its peak growth.
The guidelines warn that the plant’s toxic sap can cause severe skin burns if it comes into contact with skin exposed to sunlight, particularly during garden clearance, cutting or streaming, where accidental exposure is likely.
It also advises that suspect plants should not be handled unprotected, and that large or established growth is usually best dealt with by professional removal, as improper cutting or disturbance can increase the risk of spread and exposure. It requires equal care and attention Remove Japanese knotweed Also
As cases of giant hogweed burns have resurfaced, DEFRA says it is more important than ever to be vigilant about giant hogweed, especially as the likelihood of encountering this dangerous plant increases.
