Japanese Knotweed Elimination

⟶ Invasive species

Knotweed is the headline —
but we treat all six.

Alongside Japanese knotweed, we also survey, treat and remove giant hogweed, Himalayan balsam, rhododendron ponticum, buddleia and running bamboo. Each has its own legal status, growth pattern and removal method — send a photo for free identification and we'll tell you which one you've got and what it takes to clear it.

Schedule 9

Japanese Knotweed

Reynoutria japonica · Polygonaceae

The headline invasive — bamboo-like canes, shovel-shaped leaves and a rhizome that can punch through tarmac, drains and lightweight structures.

How to spot it
  • ·Hollow, jointed stems with reddish flecks
  • ·Heart- to shovel-shaped leaves on a zig-zag stem
  • ·Creamy white flower spikes from late August
Why it matters
Mortgage-blocking where it impacts amenity space or causes damage to structures such as tarmac, sheds or fencelines — devalues property and is illegal to cause to spread in the wild under the Wildlife & Countryside Act 1981.
Our approach
RICS-aligned survey, multi-season stem-injection or foliar herbicide programme, or full excavation with off-site disposal. 5–10 yr IBG.
Season
Visible: April–November · Treat: July–October
Japanese Knotweed detail
Hazardous

Giant Hogweed

Heracleum mantegazzianum · Apiaceae

A towering riverside umbellifer whose sap causes severe phytophotodermatitis — burns and blistering that can recur for years.

How to spot it
  • ·2–5 m tall with thick purple-blotched stems
  • ·Deeply lobed, jagged leaves up to 1.5 m wide
  • ·Huge white umbrella flower heads in summer
Why it matters
Public health risk on footpaths, schools and waterways. Listed under Schedule 9 — illegal to cause to spread.
Our approach
PPE-led cut, dig and stem-injection. Repeat treatment over 2–3 seasons until the seed bank is exhausted. Site signage during works.
Season
Visible: May–September · Treat: April–June (rosette stage)
Giant Hogweed detail
Schedule 9

Himalayan Balsam

Impatiens glandulifera · Balsaminaceae

Pretty pink 'policeman's helmet' flowers and an exploding seed pod that flings 800+ seeds per plant up to 7 m — riverbanks become monocultures in two seasons.

How to spot it
  • ·1–2 m fleshy translucent stems, often pinkish
  • ·Lance-shaped serrated leaves in whorls of three
  • ·Hooded pink/purple flowers, June–October
Why it matters
Out-competes native flora, dies back in winter and leaves bare riverbanks that erode and silt watercourses.
Our approach
Pulled by hand or strimmed before seed-set in June. Whole-catchment co-ordination with neighbours and landowners. No herbicide needed for small stands.
Season
Pull: May–early July, before pods explode
Himalayan Balsam detail
High-impact

Rhododendron ponticum

Rhododendron ponticum · Ericaceae

A dense evergreen that shades out woodland understorey, acidifies soil and harbours Phytophthora pathogens fatal to larch and oak.

How to spot it
  • ·Dark glossy leathery leaves, 6–18 cm long
  • ·Mauve-purple bell flowers in May–June
  • ·Multi-stemmed thickets, often 2–5 m tall
Why it matters
Listed under Schedule 9. Eradication is a Forestry Commission priority on woodland and SSSI sites.
Our approach
Mechanical clearance, stump treatment with approved herbicide, follow-up regrowth control over 3–5 years. Biosecurity protocol on infected sites.
Season
Treat year-round · Best clearance: October–March
Rhododendron ponticum detail
Garden escape

Buddleia (Butterfly Bush)

Buddleja davidii · Scrophulariaceae

Loved by butterflies, hated by structural engineers — colonises masonry, gutters, walls and rail infrastructure with surprising root force.

How to spot it
  • ·Arching shrub, 2–5 m, lance-shaped silver-backed leaves
  • ·Long cone-shaped lilac/purple flower spikes, July–September
  • ·Frequently self-seeded into walls, roofs and railway ballast
Why it matters
Cracks pointing, lifts coping stones, blocks gutters and accelerates damp ingress on Victorian and industrial buildings.
Our approach
Cut to base, drill-and-fill stump with approved herbicide, masonry repair where roots have penetrated. Repeat inspection at 6 and 12 months.
Season
Treat: April–September · Cut: any time
Buddleia (Butterfly Bush) detail
High-impact

Running Bamboo

Phyllostachys spp. · Poaceae

The new boundary-dispute headline. Running varieties send rhizomes 10+ m sideways, popping up in next door's lawn, patio or extension foundation.

How to spot it
  • ·Glossy, jointed canes — green, gold or black
  • ·Narrow lance-shaped leaves on side branches
  • ·New shoots emerging metres from the parent clump
Why it matters
Civil claims for nuisance and encroachment are now common. Not yet on Schedule 9, but treated by surveyors and lenders with similar caution.
Our approach
Root-barrier installation, full excavation of rhizome network, or staged cut-and-treat. Boundary-dispute reports for solicitors on request.
Season
Excavate: October–March · Treat regrowth: May–August
Running Bamboo detail

⟶ Free identification

Not sure what you've found?
Send us a photo.

One clear shot of the leaf, the stem and the wider stand — we'll come back with a positive ID and an honest next step. No fee, no upsell.

Send a photo 07582 869979