How to - Gardening Resources

The top 10 unwanted garden plants

Anja Sonnenberg
Photography by
Anja Sonnenberg

Keep an eye out for these invasive plants that can be wild and aggressive in your garden


6. Japanese knotweed (Polygonum cuspidatum)
A herbaceous shrub-like perennial, Japanese knotweed has teardrop-shaped leaves. It reproduces primarily by vigorous creeping roots, but it also spreads by seed. Once established, it’s difficult to remove. Japanese knotweed was introduced to North America in the last 1800s from eastern Asia and is still widely sold at garden centres and nurseries. It prefers open woods and forest edges, but it can tolerate a wide range of habitat.

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