Invasive Plant Species

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Invasive Plant Species

The Government has acknowledged the problems that can be caused by non-native invasive species. In 2008 the Government launched “The Invasive Non-Native Species Framework Strategy for Great Britain”. The strategy provides a framework for a more co-ordinated approach to invasive species management. It seeks to create a stronger sense of shared responsibility across government, key orgainisations, land managers and the public.

The Non-Native Species Secretariat has been established to oversee the implementation of the strategy. Details of the secretariat including risk assessments and action plans for some species are available at

In general, there are four basic methods of controlling weeds; mechanical, chemical, natural and environmental.

Invasive species listed under Schedule 9 are prohibited from release into the wild. Schedule 9, Section 14(2) prohibits ‘planting’ or ‘causing to grow’ in the wild of any plant listed in Part 2 of Schedule 9.

The following is a list of all the species of plant listed under Schedule 9 of The Wildlife and Countryside Act 1981.

Common Name Scientific Name England & Wales Scotland
Alexanders, Perfoliate Smyrnium perfoliatum
Algae, Red Grateloupia luxurians
Archangel, Variegated Yellow Lamiastrum galeobdolon subsp. Argentatum
Azalea, Yellow Rhododendron luteum
Balsam, Himalayan Impatiens glandulifera
Cotoneaster Cotoneaster horizontalis
Cotoneaster, Entire Leaved Cotoneaster integrifolius
Cotoneaster, Himalayan Cotoneaster simonsii
Cotoneaster, Hollyberry Cotoneaster bullatus
Cotoneaster, Small Leaved Cotoneaster microphyllus
Creeper, False Virginia Parthenocissus inserta
Creeper, Virginia Parthenocissus quinquefolia
Dewplant, Purple Disphyma crassifolium
False-acacia Robinia pseudoacacia
Fanwort Cabomba caroliniana
Fern, Water Azolla filiculoides
Fig, Hottentot Carpobrotus edulis
Garlic, Three-Cornered Allium triquetrum
Hogweed, Giant Heracleum mantegazzianum
Hyacinth, water Eichhornia crassipes
Kelp, Giant Macrocystis angustifolia
Kelp, Giant Macrocystis integrifolia
Kelp, Giant Macrocystis laevis
Kelp, Giant Macrocystis pyrifera
Kelp, Japanese Laminaria japonica
Knotweed, Giant Fallopia sachalinensis
Knotweed, Hybrid Fallopia japonica x Fallopia sachalinensis
Knotweed, Japanese Fallopia japonica
Knotweed, Japanese Polygonum cuspidatum
Leek, Few-flowered Allium paradoxum
Lettuce, water Pistia stratiotes
Montbretia Crocosmia x crocosmiiflora
Parrot's-feather Myriophyllum aquaticum
Pennywort, Floating Hydrocotyle ranunculoides
Potato, Duck Sagittaria latifolia
Primrose, Floating Water Ludwigia peploides
Primrose, Water Ludwigia grandiflora
Rhododendron Rhododendron ponticum
Rhubarb, Giant Gunnera tinctorial
Rose, Japanese Rosa rugosa
Salvinia, Giant Salvinia molesta
Seafingers, Green Codium fragile
Seafingers, Green Codium fragile tomentosoides
Seaweed, Californian Red Pikea californica
Seaweed, Hooked Asparagus Asparagopsis armata
Seaweed, Japanese Sargassum muticum
Seaweeds, Laver (except native species) Porphyra sp. except -
P. amethystea
P. leucosticta
P. linearis
P. miniata
P. purpurea
P. umbilicalis
Shallon Gaultheria shallon
Stonecrop, Australian swamp Crassula helmsii
Wakame Undaria pinnatifida
Waterweed, Curly Lagarosiphon major
Waterweeds All species of the genus Elodea
Invasive Plant Species