Japanese Knotweed is an invasive plant that can cause chaos, but where in Hertfordshire has it been reported?

Described as a "horticultural horror story" by some experts, due to its growth rate and deep roots, it is illegal to allow it the plant spread into the wild.

Environet, experts in removing invasive plants, have been keeping track of reported Japanese Knotweed sightings, revealing a number of hotspots in Hertfordshire.

Watford has by far the worst problem, with 77 cases within a 4km area, followed by Harpenden with 37 cases and Potters Bar with 29.

There have been 25 reported Japenese Knotweed sightings in St Albans, 24 in Hitchin and Letchworth, and 20 in Welwyn Hatfield.

Hemel Hempstead and Stevenage have the lowest number of sightings with just 14 and 6.

How to get rid of Japanese Knotweed?

If you decide to tackle Japanese Knotweed yourself, the expert suggests herbicide treatment as an option.

Here's a breakdown of the steps involved:

Plan meticulously - Inform your neighbours about the treatment schedule to minimize exposure risks. Choose a late spring or early autumn window when the plant is actively growing.

Safety first - Don't underestimate the importance of proper safety gear. Wear overalls, a safety mask, gloves, and a face shield for protection. Sheets, tarpaulins, and rubble sacks will also come in handy.

Weather matters - Choose a dry day with no rain forecast, as most herbicides can harm desired plants as well. Avoid windy conditions if using a spray application.

Targeted application - A garden sprayer is effective for applying herbicide, but use caution near water sources or sensitive areas. Alternatively, a roller, cloth, sponge, or brush can be used for localized application.

Careful disposal - Once cut, place all Knotweed material in sturdy plastic rubble sacks. Remember, this is hazardous waste and requires disposal at a designated landfill site. Check with your local council to see if they offer any collection services for Japanese Knotweed.

Persistence - Eradicating Japanese Knotweed is a long-term battle, not a quick fix. A single treatment won't do the trick. Be prepared to repeat the process two to three times a year for several years until the weed is completely eradicated and shows no signs of regrowth.