Other Invasive Weeds

There are a number of invasive non-native species subject to the same legislation as Japanese Knotweed.

Southwest Knotweed offer the treatment and management of Schedule 9 species as well as some of the problematic, invasive and sometimes highly toxic native flora.

Giant Hogweed

Propagates via seeds which disperse mostly by wind.
Produces up to 100,000 seeds per plant that remain viable for 5-7 years. exhausting this seed bank, as with many plants, is key to the long term control and eradication (where possible).
Serious skin damage can occur when skin comes into contact with sap in the presence of uv light (sunlight).

Treatment Options

Herbicide
Excavation
Cutting of tap roots
Mow, graze or plough

Cotoneaster

Over 100 species in the uk, only listed within schedule 9.
Propagates via seeds within the berries produced. these are typically dispersed by birds or falling nearby to mother plant.
Produces seeds that can remain viable for up to 5 years.

Treatment Options

Herbicide.
Excavation.
Hand pulling of plants prior to new seed dispersal.
Stump treatment during winter month.

Buddleia

typically propagates via seed >40,000 per cluster, spread by wind, water and wildlife.
exhausting this seed bank, as with many plants, is key to the long term control and eradication (where possible). the seeds have a lifetime of between 2.5-3.5 years following dispersal.

Treatment Options

Herbicide.
Excavation.
Hand pulling of plants prior to new seed dispersal before root network becomes established.

Yellow Variegated Archangel

Primarily spread by rooting stolons, requiring only one node to start a new plant. if the plant is left undisturbed, growth of 1-2 lateral metres may occur in just one growing season.
seeds are not typically viable in the UK.

Treatment Options

Herbicide.
Excavation.
Hand pulling of plants to remove all stolonatous nodes.

Himalayan Balsam

Propagates via seed which disperse between July and September, depending on the weather.
produces up to 500 seeds per plant that remain viable for up to 2 years. exhausting this seed bank, as with many plants, is key to the long term control.
when the plant dies back in winter it can cause de-vegetation of riverbanks, greatly increasing flood risks.

Treatment Options

Herbicide
Excavation
Hand pulling of plants prior to new seed dispersal is most effective as each plant has a 1 year lifespan.

Ragwort

Propagates via seed which disperse during late summer.
Produces up to 50-60,000 seeds per plant, so can rapidly colonise neglected land. whilst not in itself a problem, the plant is particularly toxic to livestock, horses and cattle in particular.
Subject to the ragwort control act 2003 – which comes into effect when land owners do not behave responsibly, where ragwort populations may present a realistic harm to livestock.

Treatment Options

Herbicide.
Excavation.
Hand pulling of plants prior to new seed dispersal.

Other Invasive Weeds

There are a number of invasive non-native species subject to the same legislation as Japanese Knotweed.

Giant Hogweed

Cotoneaster

Buddleia

Yellow Variegated Archangel

Himalayan Balsam

Ragwort

For any other Invasive Weeds please contact us and one of our team will be more than happy to assist you.

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