Ashtrees Ltd - Leeds - Vegetation Management and Habitat Creation

Japanese Knotweed

Japanese Knotweed

What is it?

Japanese knotweed (Fallopia japonica) is a non-native invasive species of plant. Since it was introduced into the UK as an ornamental garden plant in the mid-nineteenth century it has spread across the UK, particularly along watercourses, transport routes and infested waste areas.

The plant can grow up three metres in one growing season, usually April to September. The stems are similar to bamboo and form dense thickets that persist when dead long in to winter. The plant has small white flowers that bloom in late summer and produce small triangular seeds that are dark brown in colour. The extensive underground rhizomes produce the new shoots the following spring, this is the main reason why Japanese Knotweed spreads, and as such, any soil that is contaminated with its rhizomes must be disposed of appropriately and is an offence under the Wildlife and Countryside Act 1981 to not to do so.

The Problems

Specific problems caused by Japanese knotweed are:

Bullet Damage to paving and tarmac areas
Bullet Damage to flood defence structures
Bullet Damage to archaeological sites
Bullet Reduction of biodiversity through out-shading native vegetation
Bullet Restriction of access to riverbanks for anglers, bank inspection and amenity use
Bullet Reduction in land values
Bullet Increased risk of flooding through dead stems washed into river and stream channels
Bullet Increased risk of soil erosion and bank instability following removal of established stands in riparian areas
Bullet Accumulation of litter in well established stands
Bullet Aesthetically displeasing
Bullet Expensive to treat

How do you get rid of it?

Once you find Japanese knotweed on a site, it is essential that you set up some form of Japanese Knotweed management plan (KMP). Ashtrees eradication methods use the most modern, proven effective herbicide currently available, applied by trained NPTC qualified personnel to ensure compliance with Environment Agency and DEFRA guidelines and BASIS recommendations.

Why use Ashtrees Ltd

Ashtrees have extensive knowledge of identifying and eliminating Japanese Knotweed and can help at any stage of the growth stage by:

Bullet Identification and site survey
Bullet Devising a KMP
Bullet Liasing with the relevant statutory bodies
Bullet Eradication procedure
Bullet Viability tests

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