Try spraying the leaves with Knockdown Systemic Weedkiller from Doff or 'Resolva' from Westland between the beginning of March and mid-October. Treat it before it flowers, because it spreads by self-seeding. Digging it up just encourages more seeds to germinate.
Gardening Expert: |
If you can't find what you are looking for on the website then you can ask one of our experts. To get in touch with us Click Here
We will try to get back to you with an answer as soon as we can.
Did you find this answer useful? Subscribe to our newsletter for gardeing news, projects, special offers and competitions.
Rikugien Gardens
Tokyo, Japan
Royal Botanic Gardens, Kew
Richmond, United Kingdom
Ritsurin Garden
Takamatsu, Japan
Saint Petersburg Botanical Garden
Saint Petersburg, Russia
Royal Botanic Gardens Victoria
Melbourne, Australia
Gardens of Versailles
Versailles, France