Giant knotweed Fallopia sachalinensis

Status Non-native, invasive
Best Time to See

An invasive, non-native plant.

Giant knotweed is similar to Japanese knotweed in look and they grow in similar habitats. However, as the name suggests, giant knotweed it grows much taller (4-5 metres) and has much larger, elongated leaves. Like Japanese knotweed, it was introduced as a garden plant in Victorian times but was not as widely planted because of its huge size.

What's the problem?

It is increasing in the wild though, especially along riverbanks and around sea-loch shores and has similar impacts to Japanese Knotweed.

Both Japanese and Giant knotweed are listed on Schedule 9 of the Wildlife and Countryside Act in England and Wales therefore, it is also an offence to plant or otherwise cause to grow these species in the wild.