I caught up with Alan Titchmarsh at the recent BBC Gardeners’ World Live show when he was giving advice on how to combat Japanese knotweed, the peril of many gardeners.
“It was brought into this country as an ornamental plant by the Victorians, who thought it was beautiful,” he lamented.
It has an underground network of tough, fast-growing rhizomes which makes it really difficult to control and in the summer the bamboo-like stems grow to more than 2.1m (7ft), suppressing all other growth.
The RHS advises that if you’re going to try digging it out, remove as much root as possible, then repeatedly destroy regrowth.
Read our gardening column in this week’s edition - out now.