An invasive plant known as Himalayan balsam, which can become “uncontrollable,” has been found in more areas of Guernsey. Officials reported multiple sightings across the island.

The Agriculture, Countryside, and Land Management Services (ACLMS) warned that this plant, which can grow up to 3 meters (9.8 feet) tall and disperse seeds up to 7 meters (22.9 feet) through explosive pods, is difficult to remove once established.

Early removal is “critical” to protect Guernsey’s biodiversity, as Himalayan balsam can “smother the land and outcompete native species.”

Efforts over the past three years have successfully eradicated the plant in some areas, with no regrowth reported. However, new sightings have emerged in other locations.

“Thousands of these unwanted plants have been removed over the last three years,” it said.

“Without this intervention, the species could have become uncontrollable, leading to huge impacts on Guernsey’s local wildlife and biodiversity as it smothers the land and outcompetes native plant species.”

Himalayan balsam is recognised by its large, pink bonnet-shaped flowers and green seed pods.

Francis Russell, from the ACLMS non-native invasive species team, emphasised that the plant spreads “alarmingly easily,” underscoring the need for vigilance in managing its presence.

“As an annual plant it is quite distinctive and very easy to remove before it spreads hundreds of seeds,” he said.

“We really don’t want to see this species becoming established in Guernsey as it spreads alarmingly easily and will become a significant problem for our natural spaces and for landowners.”

 

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