Frequently Asked Questions
Here are the Top Ten frequently asked questions about Japanese Knotweed. If we haven’t covered your query on the subject, please don’t hesitate to contact us at Japanese Knotweed Management.
The key things to look out for are:
- Large leaves in the shape of a heart or spade
- Leaves that have a ragged edge along the stem
- The stem is hollow, a bit like bamboo
- Fleshy shoots that may be tinged red
- Spring – look for rapid-growing, tall stems with plenty of green leaves
- Summer – clusters of cream coloured flowers
- Winter – during the plant’s dormant phase the leaves will die away, leaving just the stem upright
- It takes just 10-weeks for the stem to grow three to four metres tall
- Japanese Knotweed can grow 10cm per day, twice that when at its most prolific
- The roots can grow three metres deep and spread up to seven metres horizontally
- Japanese Knotweed starts growing in the spring and can reach 3m in height by June.
- It continues to grow until autumn, dying off during the winter months
- The length of the growing season is often dictated by the weather, with our mild winters and warm, damp summers prolonging growth.
It is also vital to note that not mentioning that you have Japanese Knotweed can result in a legal claim of misrepresentation being brought against you at a later date. In fact, it’s a legal obligation as a seller to disclose the presence of Japanese Knotweed.
- Embark on an aggressive control and treatment plan
- If you are going to try some DIY, make sure to get as much of the plant’s root as possible and repeat the process as it may still take several seasons to have any measure of success
- Never mow or strim the plant. It only helps it spread and grow.
- Use herbicide weed killer