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PERSICARIA
Commonly known as Knotweed
Genus of about 150 annuals and perennials. They may be evergreen, semi-evergreen or deciduous and many spread by stolons leading to a spreading habit which can be invasive. This habit and their commonly used name knotweed can give cause for concern but used wisely they are worthy performers. They are found in a variety of habitats worldwide and most have long-lasting spikes of flowers followed by distinctive 3-angled or ovoid fruits.
Further Reading....
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White -
Height75cms (30in) -
Spread90cm (36in)
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Ground coverThese plants are typically low growing and spread quickly to inhibit weed growth on areas of bare soil
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HerbaceousEarly in the year, typically January till end of March, herbaceous plants might be supplied in 9cm pots to ensure timely despatch.Erect, clump-forming, woody-based perennial. Ovate leaves to 8cm (3in) long. Produces small, spherical clusters, 1cm (½in) across of flowers on stalks to 4cm (1½in) long from the axils of the upper leaves
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Hardy - cold winterHardy in most places throughout the UK even in severe winters. May not withstand open/exposed sites or central/northern locations. Plant can withstand temperatures down to -15°C (5°F) -
Full sun -
Partial shade
- Details
- Mature Size
- Tips and Advice
- Goes Well With
- Planting Combinations
- Other Suggestions
- See Also...
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Additional Features
Good to knowP. microcephala 'Silver Dragon'
Pests & DiseasesTrouble-free
Place of originGarden originResistant to honey fungusThese plants have little or few problems with honey fungus. -
HardinessFully hardy
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Leaf Colour (if not green)Silver variegatedPurple- and bronze-flushed
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Seasonal InterestAutumnSummer
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Soil ConditionsClay or heavy soilTolerates allAny moist soilWet or boggy soil
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WildlifeRabbit Resistant
Persicaria - Growing Guide
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75cms (30in)
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90cm (36in) |
Buy Varieties of PERSICARIA
PERSICARIA affinis
Knotweed, Polygonum
deep pink
PERSICARIA affinis 'Darjeeling Red'
Knotweed, Polygonum
excellent ground cover with bright crimson flowers
Gift-wrapping available
individually £12.50 each , 3+ £11.00 each
PERSICARIA alpina
Alpine knotweed
(syn. P. polymorpha) - tall growing with tall stems or plumes of creamy-white flowers
Gift-wrapping available
individually £12.50 each , 3+ £11.00 each
PERSICARIA amplexicaulis 'Blackfield'
Knotweed, Polygonum
slender flowers in deep red-black. A smouldering beauty
Gift-wrapping available
individually £13.50 each , 3+ £12.00 each
PERSICARIA bistorta 'Superba'
Adderwort, Bistort, Polygonum
clear pink poker flowers
Gift-wrapping available
individually £12.50 each , 3+ £11.00 each
PERSICARIA microcephala 'Red Dragon'
Bistort, Knotweed
tall and spreading variety with dramatic brownish-red leaves with black markings
PERSICARIA vaccinifolia
Knotweed, Polygonum
tiny pink flowers, good ground cover, and excellent autumn colour
Useful extras...
Fertilisers & Feeds - Vitax
Q4 Pelleted Fertiliser
A useful fertiliser suitable for use on a wide variety of plants. Q4 provides all the nutrients and trace elements essential for vigorous growth, abundant flowering and ripening of fruit.
3 options from £6.00
Fertilisers & Feeds - Empathy
Afterplant - Grow Your Own
AFTER PLANT GROW YOUR OWN seaweed is ready to use liquid concentrate that was specially formulated be used on all edible plants.
Only £8.00
Fertilisers & Feeds - Empathy
Afterplant - Tomatoes
AFTER PLANT TOMATO FEED Liquid Concentrate with Bio stimulant is a high potash liquid concentrate containing seaweed extract, plant derived amino acids and other nutrients specifically formulated to benefit tomatoes and greenhouse plants.
Only £8.00
Fertilisers & Feeds - Empathy
Rootgrow mycorrhizal fungi
Recommended by the RHS. Contains Rootgrow™ mycorrhizal fungi. Suitable for all trees and shrubs (except rhododendrons, azaleas, heathers, cranberries and blueberries)
3 options from £3.00
Fertilisers & Feeds - Empathy
Rootgrow Ericoid mycorrhizal fungi
This specially adapted Rootgrow™ mycorrhizal fungi will boost the growth of acid-loving plants like rhododendrons, azaleas, heathers and blueberries.
It contains ericoid and arbuscular mycorrhizal fungi, which are found in poor acidic soils where ericaceous plants naturally grow.
Only £7.50
Fertilisers & Feeds - Empathy
All-purpose Seaweed Stimulant
All-purpose organic concentrated seaweed feed that is a ready to use, derived from sustainable harvested kelp, that can be used on all outdoor and indoor plants, except acid loving plants.
Perfect used in conjunction with Rootgrow™.
Only £7.50
