Jurisdiction(s):
United Kingdom

Related legal acts

Key definition

Invasive Non-Native Species definition

What does Invasive Non-Native Species mean? In legal practice, Invasive Non‑Native Species (INNS) describes plant or animal species introduced outside their native range that establish and spread, harming biodiversity, habitats and ecosystem services, and creating significant environmental or economic costs. The term is descriptive; legislation more often uses “non‑native species” and “invasive alien species”. INNS controls underpin criminal offences (especially release into the wild or allowing escape), restrictions on keeping, sale, transport and breeding, and requirements for biosecurity, risk assessment, eradication and control. They frequently inform planning, development consent and environmental permitting conditions, and licensing for management action. - England & Wales: principal rules are in...

Invasive non-native species and injurious weeds in property transactions: Great Britain regulation, offences, liabilities and Japanese knotweed risk management

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Practice notes

What are invasive species?

‘Invasive species’ describes plants and animals that can take hold, spread or grow in ways likely to cause nuisance or impose other financial burdens. Within property transactions, the primary concern is typically Invasive Non-Native Species (INNS). These are organisms introduced beyond their usual geographic range that may harm native flora and/or fauna or lead to notable environmental and/or economic Costs. For further details, see Practice Note: Invasive species—regulation and offences...

What weeds are regulated?

Injurious weeds are invasive native or naturalised species listed in the Weeds Act 1959 (WA 1959):

common ragwort ( Senecio jacobea )
broad-leaved dock ( Rumex obtusifolius )
curled dock ( Rumex crispus )
creeping or field thistle ( Cirsium arvense )
spear thistle ( Cirsium vulgare )

The Wildlife and Countryside Act 1981 (WCA 1981), as amended, identifies in Schedule 9 the animals (Part I) and plants (Part II) for which it is an offence to allow the named species to spread in the wild. The Invasive Alien Species (Enforcement and Permitting) Order...

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Web page updated on 29/05/2026

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