For a more convenient way of detecting the presence of this Japanese Knotweed, an interactive heat map tool has been introduced. This map allows potential investors to directly input their postcode to gauge the number of confirmed knotweed sightings within a 4km radius of any property they might be interested in buying.
The map also features coloured hotspots, with yellow, orange or, for worst cases, red. This system helps to shed light on areas most affected by this rapidly spreading plant.
The tool goes beyond just tracking: it also offers users the ability to contribute sightings by uploading a photo for verification by experts.
Spotting Japanese Knotweed
Recognising Japanese knotweed is an advantageous skill for any property investor. The plant typically shows its first shoots in late March or early April. By mid-summer, this rapid-growing green invader can reach a height of up to 2.5 metres.
The plant has hard, bamboo-like canes, and sports distinctive shield-shaped bright green leaves growing in a zigzag pattern along the stem. Mature plants flower in August, displaying clusters of delicate tasselled creamy-white flowers.
Interestingly, the Japanese Knotweed plants found within UK are all female. This means they do not produce viable seeds, and are usually spread accidentally through the movement of soil or gardening waste.
The Financial and Legal Risks
The threat from Japanese Knotweed is not just to your property’s physical aspect – it can have significant economic and legal implications as well. In fact, the estimated cost of dealing with it is approximately £250m a year for the UK economy as a whole.
The risk of damage extends not just to the main buildings, but also outdoor structures and gardens. In addition to encroachment risks, investors should be aware of potential legal disputes that can occur between neighbours if Knotweed growth uncontrollably crosses property boundaries.
Moreover, during the selling process, sellers are asked directly about any presence of Japanese knotweed. This includes even instances where the plant is not visibly present but lies beneath the ground or within 3 meters of the property boundary. Failing to disclose such information can lead to legal action by the buyer for misrepresentation.
Firms like Environet estimate that around five per cent of the UK’s houses are currently affected by Japanese Knotweed. This has a significant impact on property values, typically causing a reduction of around five to 10 per cent.
Recognise, Monitor and Act
“Vigilance is the best way to protect your property from the risks posed by Japanese knotweed,” advises Nic Seal, the founder of Environet. It’s crucial that you know what Knotweed looks like and how it differs from other common garden weeds.
Knowing the plant’s life cycle helps, too. For instance, by late autumn and winter, the above-ground growth dies back, making the weed harder to spot. As such, being extra careful when viewing properties during this period is essential.
Dealing with the Japanese Knotweed issue doesn’t need to be a nightmare. With professional help, the Knotweed can be successfully treated and a property’s value largely restored. So remember, your investment is not just about location and price – be sure to factor in environmental risks like this, too.