Bistort knotweed - sowing, planting, dividing, maintaining -


Knotweed, Persicaria bistorta, polygonum bistoria, flowering spikes from the countryside

This bistort knotweed is beautiful, it is carpeted, with erect ears formed in inflorescence of tiny pink flowers. It enjoys a particularly rapid growth. It forms oval leaves and the spikes appear in late spring in May and June. It revives (pun intended) sometimes with flowering in late summer.
Flowering plant with sun exposure and partial shade, it can be grown anywhere, it prefers rich and deep soils, but we can grow it almost in all soils except those that are really too poor.

Botanical name:

• Persicaria bistorta

Plant info:

• Cycle: Perennial
• Foliage: Persistent
• Hardiness: Hardy (-30 ° C)
• Family: Polygonaceae, Polygonaceae
• Harbor : Tuft upright
• Exhibition: Sun and partial shade
• Ground : Deep, rich and cool - Likes clay soils.
• Sowing: February March
• Division: Spring
• Plantation: April May
• Flowering: June to October
• Fruiting: -
• Rooting: Rhizomes
• Cultivation area: Everywhere zone 4 to 9 see hardiness card
• Origin: South America - Chile
• Honey plant: Yes
• Edible plant: No
• Poisonous Plant: The sap is irritating

Particularities:

• It is also called: Bistorte Couleuvrée, Langue de boeuf, Bistorte commune and in English: Water Smartweed, Bistort and Common Bistort.
• The flowers of the Bistorte Knotweed, very small, are gathered in a tight spike.
• Its irritating sap, during autumn interviews, it is advisable to wear gloves.

What advantages in the garden:

• Aesthetics of the plant.
• Beautiful flowering, in spring, it often resumes at the end of summer, with a little less flamboyance.
• Rapid growth.
• The plant is very melliferous - nectariferous

What exposure for the Bistorte knotweed?

• Sun and partial shade

What soil?

• Bistort knotweed appreciates cool clay soils and even the edges of ponds.
• But in most rich, deep and cool soils the plant will thrive perfectly.

Method of multiplication?

• Sowing under shelter, from February.
• Sowing in place from March.
• The plant reseeds spontaneously.

• You can divide the plant in the fall or spring.

How to sow bistort knotweed?

Sowing under shelter, from February

• Prepare a box filled with a mixture of seed soil.
• Moisten the soil well.
• Pack it down with a small board.
• Sow loosely.
• Cover the seeds a little with potting soil.
• Tamp again.
• Keep the soil moist until emergence.

When the seedlings bear a few leaves:
• Prepare cups filled with the same potting soil.
• Choose the most beautiful and strongest plants.
• Place them in a cup without damaging the roots.
• Squeeze the soil with your fingers and tamp down the soil.
• Water on dry soil until planting.

Sowing in the ground:

• Loosen the soil on a spade height.
• Amend the soil with potting soil or mature compost.
• Refine the earth.
• Water.
• Sow clear.
• Cover the seedlings with a thin layer of potting soil.
• Tamp with a small board.

When to plant

• Plant in spring or fall before the cold weather.

How to plant common knotweed?

• Work the soil on a spade height.
• Mix garden soil with planting soil and mature compost.
• Place the bistort plants in a pot.
• Space the plants 0.30 m in all directions.
• Recap, tamp ...
• Water.

Culture in pots?

• Yes, in a large pot it is possible,
• Prepare a very potting mix and garden soil.
• Place several feet to create an effect of density.

Interview :

• Cut off faded flowers
• In autumn cut back the stems with damaged foliage.
• Practice division to re-energize the root strain every 2-3 years.

Flowering of knotweed bistort:

Beautiful, tight, pink flowers in spikes from June through summer. Flowering is most intense at the beginning and then at the end of summer.

Varieties:

• Persicaria bistorta "Superba" : whose ears or panicles are larger than the type species.

What to plant with?

• Grasses, other plants with spikes such as aromatic hyssop, field geraniums ...

Use :

ATa garden: In clumps, borders, ground covers, clearings
• Without garden: D
years a large pot of earth

Quick sheet:

By McZusatz - Own work - CC-BY-SA-3.0, via Wikipedia.org


Replace grass with ground covers

In the mountains, the Ice Saints (May 11 to 13) are not a legend. Transplant the squash after May 15 and under a mini tunnel to protect them from cool nights. If you buy your plants, prefer those from local market gardeners, they are acclimatized and are less fragile.
With a greenhouse or a frame, you can sow in early May in pots to transplant the plants some three weeks later.
Justine Herman prefers to grow varieties of squash that do not hybridize like the pumpkin (Cucurbita maxima) and butternut (C. moschata), in order to collect the seeds for the following year. There are many varieties with small fruits such as Buttercup which feeds 2 to 4 people. With squash, it's easy to vary the pleasures


Amphibious knotweed

Amphibious knotweed (Credit: gravitat-OFF / CC BY 2.0 / Flickr)

Amphibious knotweed (Persicaria amphibia or Polygonum amphibium) forms beautiful heads of reddish flowers in the summer. It grows on the firm ground of the banks but also in open water, up to 40В cm of depth. In this case, the foliage floats on the surface.

Guides, letter models, practical sheets. We leave the card to you. Make your choice !

Amphibious knotweed (Persicaria amphibia or Polygonum amphibium) forms beautiful heads of reddish flowers in the summer. It grows on the firm ground of the banks but also in open water, up to 40В cm of depth. In this case, the foliage floats on the surface.

Amphibious knotweed (Credit: gravitat-OFF / CC BY 2.0 / Flickr)

Amphibious knotweed in summary

Amphibious knotweed, Aquatic knotweed

Persicaria amphibia, Polygonum amphibium

Ornamental plant в – ¶ Decorative foliage plant

Pond plant в – ¶ Helophytes (waterfront) | Amphiphytes (bank plant)

Vegetation Perennial : Plant that lives more than two years.
Annual : Plant that lives less than a year.
Biennial : Plant whose life cycle lasts two years. In the first year, the plant grows in the second year, it gives flowers and fruits, then it dies.
To know more

Foliage Persistent : The foliage lasts all year.
Semi-persistent or semi-deciduous : The plant retains part of its foliage all year round.
Lapsed : The plant loses its leaves in the fall.
To know more

Height at maturity Mature height is the height to which the plant naturally rises when it is in the most favorable conditions.
It may take some time for the plant to reach this height, depending on the speed of its growth.
The plant may also never reach its height at maturity, if it is pruned regularly, or if it is not cultivated in the optimal conditions for its growth.
To know more

Interview Easy : The plant does not require special care, or very simple care.
Moderate : The plant requires regular care or a little gardening practice.
Difficult : The plant requires important care and gardening skills.
To know more

Water requirement The water requirement of a plant can be supplied by rain, natural soil moisture or watering. To evaluate the necessary watering, it is also necessary to take into account the ambient temperature, because of the evaporation, and the capacity of the soil to retain water.
Low : For a houseplant, water monthly. For an outdoor plant, it tolerates drought well.
Way : For a houseplant, water weekly or every two weeks. For an outdoor plant, it will need water supplies before the soil dries up.
Important : For a houseplant, water several times a week. For an outdoor plant, it needs abundant and regular water supplies.
To know more

Growth Slow : The plant reaches maturity in several decades.
Normal : The plant reaches maturity in a few years.
Fast : The plant reaches maturity in a few months.
To know more

Multiplication Propagation involves creating a new plant yourself.
Sowing : The plant reproduces by planting seeds.
To know more
Division : Part of the root (rhizome, tuber) is used to create new shoots.
To know more
Cuttings : A branch is planted in the ground, where it produces new roots.
To know more
Layering : The branch is not cut from the plant, but it is partly buried in the earth, where it develops its own roots.
To know more
Graft : A plant fragment is implanted on another plant.
To know more
Impossible : It is not possible, for an individual, to multiply his plant. If he wants another one, he should buy it from a professional.

Cold resistance Resistant (rustic) : Frost resistant plant.
To protect (semi-rustic) : Plant which supports the freshness but which requires a protection against the frost.
To return (fragile) : Plant which fears the cold and which must be sheltered during the cold season.
To know more

Soil type Clay soil : Heavy and sticky soil when wet, which hardens and cracks when drying.
Limestone soil : Clear and chalky earth, dry in summer and muddy in winter.
Sandy soil : Light soil, easy to work with and which retains water poorly.
Stony ground : Soil loaded with pebbles and poor in organic matter.
Humidor : Black and easy to work, it looks like forest earth.
Heather land : Acidic soil (pHВ 4 Г 5), sandy and rich in humus.
Potting soil : It's easy, this land can be bought in stores!
To know more

Soil pH The pH measures acidity of the soil.
Alkaline soil : The pH is above 7. These are mainly calcareous soils.
Neutral soil : The pH is between 6.5 and 7.2. Most plants grow well there.
Acidic soil : The pH is below 7. This is mainly heather land.
To know more

Soil moisture Soil moisture does not depend on rain, but on how the soil retains water or not.
Drained soil : Fresh soil but where water does not stagnate.
Wet soil : Soil where water stagnates.
Dry soil : Soil that does not retain water.
Fresh soil : Soil which remains constantly moist (but not soaked). To know more

Exposure Sun : The plant should have direct sun all day. Inside, it is directly (less than 1m) in front of a window facing south or west.
Part shade : The plant should have sun only part of the day. Indoors, it is in front of a window to the east or further away from a window facing south or west.
Shadow : The plant should be in the shade of other plants. Indoors, this is the case for rooms in winter, windows to the north or partially obscured and when the plant is far from the window (+ 2 m).
To know more

Planting Full earth : The plant can be planted directly in the earth.
Bin, pot or planter : The plant can be planted in a container. (The volume of the container must be adapted to the size of the plant.)
To know more

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

Amphibious knotweed, or aquatic knotweed, can become an invasive species, it must be isolated from other plants. Persicaria amphibia easily differs from knotweed, Persicaria bistorta, by the heightsВ: 10 to 15В cm only for the amphibian against 45В cm for the bistort.

This amphibious perennial is a hardy adapted to European latitudes. Native to the northern hemisphere (Asia, America, Europe), amphibious knotweed grows in water as well as in damp soil. It is proposed as an excellent ground cover that can be used for tidal zones. Thanks to its great adaptability, it can be found alternately submerged then in barely humid areas without problem.

Vigorous plant, with creeping stems and, its leaves are variable in shape depending on the habitat. In water, they are hairless, floating, petiolate for a long time, contracted at the base. Leaf blades appear on long petioles and have an elongated, oval-pointed surface. But with a terrestrial establishment, the leaves are sometimes pubescent, slightly covered with hairs, short, rounded at the base, at the level of their attachment.

When the plantation is terrestrial, from the, shoots appear at ground level, which multiply and form leaf blades which move towards the water. Near the bank, the rhizome becomes underground, but remains crawling in submerged situation.

The pale pink flowers, in compact spikes, are very decorative because knotweeds are very flowering. The inflorescences are very noticeable, their pink color is 10В cm above the water level and are 1В cm thick. The terrestrial variety covers the wet fields in, it flowers in the same way as the submerged plants but in a more discrete way and the germinations (already rare for the submerged plants) are almost non-existent in exposed areas.

adviceВ: the association of the two forms of culture, submerged and terrestrial, creates a nice contrast.


Leymus arenarius

Leymus arenarius (Credit: Matt Lavin / CC BY-Sa 2.0 / Flickr)

Azure wheat, Leymus arenarius, is a rhizomatous grass with surprising silvery blue foliage. Easy to cultivate, resistant to dryness, plant solution for seaside gardens, it also allows you to quickly garnish a sunny embankment.

Guides, letter models, practical sheets. We leave the card to you. Make your choice !

Azure wheat, Leymus arenarius, is a rhizomatous grass with surprising silvery blue foliage. Easy to cultivate, resistant to dryness, plant solution for seaside gardens, it also allows you to quickly garnish a sunny embankment.

Leymus arenarius (Credit: Matt Lavin / CC BY-Sa 2.0 / Flickr)

Leymus arenarius in summary

Wheat Azure, Sea Rye, Sand Elyme

Ornamental plant в – ¶ Herbs and grasses

Vegetation Perennial : Plant that lives more than two years.
Annual : Plant that lives less than a year.
Biennial : Plant whose life cycle lasts two years. In the first year, the plant grows in the second year, it gives flowers and fruits, then it dies.
To know more

Foliage Persistent : The foliage lasts all year.
Semi-persistent or semi-deciduous : The plant retains part of its foliage all year round.
Lapsed : The plant loses its leaves in the fall.
To know more

Height at maturity Mature height is the height to which the plant naturally rises when it is in the most favorable conditions.
It may take some time for the plant to reach this height, depending on the speed of its growth.
The plant may also never reach its height at maturity, if it is pruned regularly, or if it is not cultivated in the optimal conditions for its growth.
To know more

Interview Easy : The plant does not require special care, or very simple care.
Moderate : The plant requires regular care or a little gardening practice.
Difficult : The plant requires important care and gardening skills.
To know more

Water requirement The water requirement of a plant can be supplied by rain, natural soil moisture or watering. To evaluate the necessary watering, it is also necessary to take into account the ambient temperature, because of the evaporation, and the capacity of the soil to retain water.
Low : For a houseplant, water monthly. For an outdoor plant, it tolerates drought well.
Way : For a houseplant, water weekly or every two weeks. For an outdoor plant, it will need water supplies before the soil dries up.
Important : For a houseplant, water several times a week. For an outdoor plant, it needs abundant and regular water supplies.
To know more

Growth Slow : The plant reaches maturity in several decades.
Normal : The plant reaches maturity in a few years.
Fast : The plant reaches maturity in a few months.
To know more

Multiplication Propagation involves creating a new plant yourself.
Sowing : The plant reproduces by planting seeds.
To know more
Division : Part of the root (rhizome, tuber) is used to create new shoots.
To know more
Cuttings : A branch is planted in the ground, where it produces new roots.
To know more
Layering : The branch is not cut from the plant, but it is partly buried in the earth, where it develops its own roots.
To know more
Graft : A plant fragment is implanted on another plant.
To know more
Impossible : It is not possible, for an individual, to multiply his plant. If he wants another, he must buy it from a professional.

Cold resistance Resistant (rustic) : Frost resistant plant.
To protect (semi-rustic) : Plant which supports the freshness but which requires a protection against the frost.
To return (fragile) : Plant which fears the cold and which must be sheltered during the cold season.
To know more

Soil type Clay soil : Heavy and sticky soil when wet, which hardens and cracks when drying.
Limestone soil : Clear and chalky earth, dry in summer and muddy in winter.
Sandy soil : Light soil, easy to work with and which retains water poorly.
Stony ground : Soil loaded with pebbles and poor in organic matter.
Humidor : Black and easy to work, it looks like forest earth.
Heather land : Acidic soil (pHВ 4 Г 5), sandy and rich in humus.
Potting soil : It's easy, this land can be bought in stores!
To know more

Soil pH The pH measures the acidity of the soil.
Alkaline soil : The pH is above 7. These are mainly calcareous soils.
Neutral soil : The pH is between 6.5 and 7.2. Most plants grow well there.
Acidic soil : The pH is below 7. This is mainly heather land.
To know more

Soil moisture Soil moisture does not depend on rain, but on how the soil retains water or not.
Drained soil : Fresh soil but where water does not stagnate.
Wet ground : Soil where water stagnates.
Dry soil : Soil that does not retain water.
Fresh soil : Soil which remains constantly moist (but not soaked). To know more

Exposure Sun : The plant should have direct sun all day. Inside, it is directly (less than 1m) in front of a window facing south or west.
Part shade : The plant should have sun only part of the day. Indoors, it is in front of a window to the east or further away from a window facing south or west.
Shadow : The plant should be in the shade of other plants. Indoors, this is the case for rooms in winter, windows to the north or partially obscured and when the plant is far from the window (+ 2 m).
To know more

Planting Full earth : The plant can be planted directly in the earth.
Bin, pot or planter : The plant can be planted in a container. (The volume of the container must be adapted to the size of the plant.)
To know more

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

JANUARY FEBRUARY MARCH
APRIL MAY JUNE
JULY August SEVEN.
OCT. NOV. From C.

Genre Leymus is part of the Gramineae (or Poaceae) family and comprises about forty perennial and rhizomatous species that are generally found in the meadows of the temperate northern hemisphere. The Leymus, or Sand lymes, are characterized by rapid growth and excellent hardiness. They are recognized by their linear foliage, quite rigid and glaucous, and their summer flowering which takes the form of terminal clusters made up of one or more pillets.

Leymus arenarius (syn. Elymus arenarius) is the species most commonly marketed and cultivated in the garden. Often referred to as В «В azure wheatВ В ", this deciduous grass, native to Europe (north, west and south-east) and north of Asia and America, forms a bushy tuft and spread to the stems robust and rigorous. It grows rapidly with its long traces. Its long leaves, about fifty centimeters in length, display a beautiful bluish green hue lightened by a silver. One centimeter wide, they are flat along the entire length, offering just a coiled tip. In early summer, the plant is topped by vigorous stems terminated in dense blue-green, then golden-yellow spikes at maturity, which resemble those of wheat and which persist until in late fall. All vegetation turns yellow in the winter.

Reserve the azure wheat in sunny locations that will benefit from being quickly covered: rockery, embankment, natural massif, gravel garden…

We often meet Leymus arenarius on the dunes and rocks of the Channel coast but also on the Vendée, Charentaise and Landes coasts. It grows in colonies constituting a long vegetal strip along the sea. Beware of its great vigor against neighboring less expansive plants. If necessary, install it in the ground with its container.

Pot culture is possible but its deciduous vegetation makes it prefer other bluish decorative grasses all year round: agropyron (Elymus magellanicus), blue fescue, Helictotrichon…


Basic rules for making a success of your beds

Composed of shrubs, ground cover perennials and biennials reseeding themselves spontaneously, all the scenes have one thing in common: no or little maintenance. To succeed, choose plants adapted to the soil and meteorological characteristics of the region.

  • The ideal land, well balanced sand, clay and humus rarely exist. If yours is too light, just bring compost to improve its structure.
  • If, on the contrary, it is heavy and sticky, correct its drainage by adding gravel or river sand. Begin planting when frost is no longer to be feared.
Buy shrubs in containers. They are thus planted all year round except during periods of frost. Do not necessarily choose the largest because small subjects often have a much better recovery.

The perennials offered are sold in pots. They need a year or two to develop. If the massif seems a little bare to you, sow or plant a few annuals to fill in the gaps: dwarf cosmos, alysse, impatiens ...

Once the plantations are completed, spread a layer of mulch on the ground : crushed bark, wood chips, cocoa bark, flax flakes.
Water regularly until fall in the first year of cultivation.


Video: Let it Grow - Japanese Knotweed Timelapse


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