Japanese Knotweed near veg patch

Oh dear not the gardeners friend at all.. I would cut and burn any stems left from last year and then spray it off with Roundup tree and stump killer.. It is a very voracious weed that people will turn their back on if possible as difficult to eradicate.. If it was me I would erect a screen around it so there is no over spray drift off..! You may need to spray several times as new growth pushes through..
If it is coming from someone else's land un controlled it is notifiable to local council..
Not something any of us want and need to get rid of ASAP..!

 

"Control


Non-chemical controls
When tackling Japanese knotweed, cultural control methods pose some problems;

• Digging out is possible, but due to the depth that the rhizomes can penetrate, regrowth usually occurs. This method also creates problems over disposal as Japanese knotweed is classed as 'controlled waste' under the Environmental Protection Act 1990. This requires disposal at licensed landfill sites. Specialist Japanese knotweed contractors are usually licensed to safely remove the weed from site but check first before employing their services. Alternatively, it can be destroyed on site by allowing it to dry out before burning. On no account should Japanese knotweed be included with normal household waste or put out in green waste collection schemes
• If digging out is attempted, remove as much root as possible, then repeatedly destroy regrowth. In this way the energy reserves in the remaining underground parts will be gradually exhausted; a process which may, however, take several seasons

Biological control

• A plant sucker (psyllid) is being released in the UK as a biological control for Japanese knotweed. It is currently only being released at a handful of trial sites and is not available to gardeners. However, if successful it will be released more widely and will become widespread in Britain over the next five to ten years by natural spread

Chemical controls
When using weedkillers, always follow the instructions on the pack to make effective and economic use of the product while minimising risks to people and the environment.

Glyphosate

• Perhaps the most effective and simplest method for the home gardener to tackle Japanese knotweed is with the glyphosate-based weedkiller Scotts Roundup Tree Stump & Rootkiller. This has label recommendation for controlling Japanese knotweed, instructing it to be applied to the cut canes. Bayer Garden Super Strength Weedkiller also has label control for this weed
• Alternatively, try other tough formulations of glyphosate (e.g. Scotts Roundup Ultra, Bayer Garden Rootkill, Doff Maxi Strength Glyphosate Weedkiller or Westland Resolva Xtra Tough Concentrate)
• Glyphosate is usually applied to the foliage and is passed within the plant to the underground parts
• It is useful to cut away old stems during the previous winter to allow good access. As with other weeds, the most effective time for spraying Japanese knotweed with glyphosate is at the flowering stage in late summer. However, it is difficult to spray at this stage, when the weed is 2.1m (7ft) or more high
• A more practical approach is to allow Japanese knotweed to grow to about 90cm (3ft), which will usually be reached in May, and spray then. There will be regrowth and consequently a second application in mid-summer is useful. Check during September and if it has grown once more, spray again before growth begins to die down in the autumn. Check again the following spring
• Avoid spray coming into contact with garden plants. Glyphosate-treated knotweed will often produce small-leaved, bushy regrowth 50-90cm (20in-3ft) in height the following spring. This is very different in appearance to the normal plant and it is essential that this regrowth is treated
• It usually takes at least three to four seasons to eradicate Japanese knotweed using glyphosate. Professional contractors, however, will have access to more powerful weedkillers that may reduce this period by half

Residual control

• The residual weedkillers Bayer Garden Path & Drive Weedkiller and Scotts Weedol Pathclear products containing glyphosate/diflufenican in a soluble sachet. They may provide a moderate check in growth, but because of the extremely persistent rhizomes, is unlikely to eradicate the weed."

 

"What is Japanese knotweed?


Japanese knotweed is a strong-growing, clump-forming perennial, with tall, dense annual stems. Stem growth is renewed each year from the stout, deeply-penetrating rhizomes (creeping underground stems).

New legislation
An amendment to the Anti-social Behaviour, Crime and Policing Act 2014 includes Japanese knotweed and other invasive non-native plants. Full details of how this will work for the homeowner are not yet available, but here are some key points:

• It is not illegal to have Japanese knotweed in your garden
• On your property, you should aim to control this plant and other invasive non-native plants such as Himalayan balsam and giant hogweed, to prevent them becoming a problem in your neighbourhood. If they have a "detrimental effect of a persistant or continuing nature on the quality of life of those in the locality", the legislation could be used to enforce its control
• Control can be carried out by the homeowner (see the control section below) and doesn't require a specialist company. However, a specialist company will be skilled at control and can dispose of the plant waste
• Identification is important. Japanese knotweed can be confused with other plants including Persicaria microcephala (e.g. P. microcephala 'Red Dragon'), Leycesteria formosa and Houttuynia cordata
• Where problems with Japanese knotweed occur in neighbouring gardens, we suggest that you speak or correspond directly with your neighbours (who may already be taking action to control this difficult weed). These informal steps should be taken before contacting your council to talk about control using the legislation

For more information, see the Home Office Information Note: Japanese knotweed."