Knotweed Knowhow:
How To Identify And Distinguish
Between Different Types Of Knotweed
Japanese knotweed is an impressive species that grows rapidly to a height of 2 – 3 metres (6-10 feet) in a single season.
I
n the spring, new growth emerges as
rapidly growing soft red/purple shoots
reminiscent of asparagus spears. The
stems are hollow and bamboo-like
and can grow as much as 2 cm per
day. As the shoots grow into canes
the leaves unfurl and the plant turns
green, with stem diameters of up to 40
mm (1.6 inches).
The stem growth is distinctive with one
stem or leaf stem (petiole) per node
producing a zigzag pattern in the stem.
The extensive rhizome system allows
Japanese Knotweed
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Japanese Knotweed Ltd has been
trusted with the responsibility of resolving
the knotweed problems for thousands of
customers. We are the preferred knotweed
specialist for possessing an unrivalled
Fallopia Japonica
The most common type of knotweed
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Smooth mid-green colour leaves
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Small creamy white flowers in loose clusters in late summer
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Bohemica
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Leaves longer than wide, pointed at the tip with veins reddish purple
when immature
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Creamy-white flowers appear in dense clusters in late summer/early
autumn
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Darker green than the japonica
Fallopia japonica var. Compacta
It reaches only 1-1.8m (40 inches) in height
Leaves have crinkled edges and a leathery texture
Leaves are variable in shape, up to 11cm/4 inches long and up to
10cm/3.5 inches wide, often curve in concave form
Giant Knotweed
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Hybrid between Japanese and Giant knotweeds
Leaves are larger than Fallopia Japonica, up to 25cm/10 inches long
and 18cm/7 inches wide, and in heart shape
Our locally based Surveyors, Supervisors
and Field Technicians provide a rapid local
and friendly service throughout England,
Scotland and Wales. Japanese Knotweed
Ltd provides a FREE service to identify
plants you suspect as being Japanese
knotweed (or other invasive plants).
Simply email us a picture of the plant and
we endeavour to identify it for you,
[email protected]
White or pale pink flowers appear in late summer, which often mature to
dark pink or red
Fallopia x bohemica
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depth of knowledge and commercial
experience to help companies, councils
and homeowners alike.
Dwarf Japanese Knotweed
One stem per node, with a Zig-Zag stem growth pattern
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new shoots to be produced from any
part of the rooting system in the spring,
with a 1m² stand of knotweed capable of
producing as many as 238 new shoots.
This new growth forms dense thickets
(which are known as ‘stands’) with new
shoots remaining interlinked back to the
parent plant.
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Fallopia sachalinensis
Similar to Fallopia japonica but grows much taller (up to 4-5 metres or
13-14 feet)
Much larger elongated leaves, up to 40cm/16 inches long and up to
27cm/11 inches wide
Leaves are pointed at the tip, somewhat crinkly & long white hairs on the
underside
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Creamy-white flowers appear in late summer/early autumn in dense
panicles