Tag Archives: Japanese Knotweed treatment

Large Infestations of Japanese Knotweed

Treating large infestations of Japanese knotweed does take time. Using stem injections six months later can have some good initial effect, but still requires long term monitoring.  (Yes for those keen eyes there is more Japanese knotweed in the background of the second photo! At this visit requested not to treat it, which is why monitoring is also so important to control the activity of the plant.)

What to do when you find Japanese knotweed

PCA’s Technical Manager for Invasive Weeds Peter Fitzsimons, spoke on the BBC Radio Ulster – On Your Behalf programme about Japanese Knotweed. The programme discusses ‘the issues with Japanese Knotweed, what to do and what not to do when you find it on your propertyTo listen please click the link, the article is 27 minutes in: https://www.bbc.co.uk/programmes/m00003t3

How to identify Japanese knotweed

If you’re concerned a fast growing plant in your garden may be Japanese knotweed, here’s what to look out for:

Bamboo like stems, which are green with purple speckles

Zig-zag stems with flat leaves, heart shaped at the very tip

Roots that snap like a carrot, with an orange circle to them

Invasive plants to take root at RHS Chelsea Flower Show

Experts from the PCA’s Invasive Weed Control Group are to showcase 14 of the good, the bad and the ugly invasive non-native plants which are currently thriving in gardens across the country at this years RHS Chelsea Flower Show. Click here to read more:  http://press.rhs.org.uk/RHS-Shows/Chelsea/Press-releases/Invasive-plants-to-take-root-at-RHS-Chelsea-Flower.aspx