Government scientists are releasing crayfish, insects, and fungi to control invasive species across Britain.
The work targets threats such as Japanese knotweed, Himalayan balsam, and floating pennywort.
The programme is led by the Animal and Plant Health Agency under targets set by Department for Environment, Food and Rural Affairs.
Ministers want to cut the establishment of invasive species by 50% by 2030.
Researchers carefully test biological control agents to ensure they harm only target species.
A South American weevil is reducing floating pennywort in rivers.
Scientists at Centre for Agriculture and Bioscience International are also deploying insects and fungi against knotweed and balsam.
Early trials show encouraging results, with reduced plant growth over time.
The approach lowers long-term labour needs as control agents spread naturally.
Alongside this, conservationists are protecting native species such as the white-clawed crayfish.
Ark sites and hatcheries in England are helping shield them from invasive signal crayfish.
Officials warn future risks include escaped raccoons and raccoon dogs, which could harm wildlife.
The government says invasive species already cost Britain nearly £2bn each year.
