Knotweed

An easy perennial, with a seemingly never-ending blooming period.
Common name : Knotweed
Scientific name : Persicaria amplexicaulis
Family : Polygonaceae
Category : Perennials
Type of plant : Perennial
Full description for Persicaria amplexicaulis not yet available.

Sowing & planting

J
F
M
A
M
J
J
A
S
O
N
D

Flowering

J
F
M
A
M
J
J
A
S
O
N
D

Caracteristics

Exposition
Water needs
Granulométrie plants.granulometry_3
Frost-resistance High
Zone USDA 5a
Height 10 - 150
pH 6 - 7

Identify my knotweed

Of the family Polygonaceae, the persicaria have a evergreen or deciduous foliage, basal, whole, alternate, sessile leaves. The flowers are arranged in panicles or ears, are small, bells or funnel, and last a long time. Many species are rhizomatous or stoloniferous.

Plant my knotweed

Knotweeds prefer moist, moist soil, even in the sun or partial shade. Dip the clumps in a tray filled with water to moisten them well. Plant them when the water is no longer flowing out of the bucket. Prepare the soil: make holes, leaving a spacing of 20 to 30 cm per foot. Put the plants in these holes. Cover with soil and tamp gently to avoid air from the roots, then water. In pots, plant in a fairly rich compost, in a container proportionate to the expected development of the species you are planting. Provide a saucer or a sub-pot to keep the earth moist as long as possible.

Weed my knotweed

It may be your knots that you will have to weed if they feel a little too much at home ;-)

Water my knotweed

Water during the summer period, once a week if it is very dry, rather in the morning, sparing the leaves.

Fertilize my knotweed

With a respectful approach to soil life, it's always better to fertilize a little in advance with organic material that will decompose; spread out a compost that isn't entirely decomposed, with well decomposed manure at the plant's base, and incorporate over 10 cm with a hoe. This operation is carried out in winter so that earthworms and bacteria have enough time to do their job.

Propagate my knotweed

You may divide the plant in autumn. Chose an older part of the plant that no longer flower well. Dig it up with the help of a pitchfork, taking care not to destroy the roots. Drive the pitchfork into the middle of the clump to divide it in half, in one good cut. Replant the two parts of the plant immediately.

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