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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....
  • White
  • Height
    75cms (30in)
  • Spread
    90cm (36in)
  • Ground cover
    These plants are typically low growing and spread quickly to inhibit weed growth on areas of bare soil
  • Herbaceous
    Early 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
  • Hardy - cold winter
    Hardy 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
  • Additional Features
    Good to know
    P. microcephala 'Silver Dragon'
    Pests & Diseases
    Trouble-free
    Place of origin
    Garden origin
    Resistant to honey fungus
    These plants have little or few problems with honey fungus.
  • Hardiness
    Fully hardy
  • Leaf Colour (if not green)
    Silver variegated
    Purple- and bronze-flushed
  • Seasonal Interest
    Autumn
    Summer
  • Soil Conditions
    Clay or heavy soil
    Tolerates all
    Any moist soil
    Wet or boggy soil
  • Wildlife
    Rabbit Resistant
Persicaria - Growing Guide
75cms (30in)
Herbaceous - guide for size not form Watering Can
  90cm (36in)
 

Buy Varieties of PERSICARIA

PERSICARIA affinis

PERSICARIA affinis

Knotweed, Polygonum

deep pink

 
individually £12.50 each , 3+ £11.00 each 
Notify me when this plant is available to order
Available Early Spring 2025 - Spring according to the Met office is defined as March 1st - May 31st. Therefore early spring is early March to mid-April. This is not a guaranteed date but an estimate and subject to availability.
PERSICARIA affinis 'Darjeeling Red'

PERSICARIA affinis 'Darjeeling Red'

Knotweed, Polygonum

excellent ground cover with bright crimson flowers

 
Gift Wrapping available on this plant - UK Delivery Only Gift-wrapping available
individually £12.50 each , 3+ £11.00 each 
Gift Wrapping available on this plant
PERSICARIA alpina

PERSICARIA alpina

Alpine knotweed

(syn. P. polymorpha) - tall growing with tall stems or plumes of creamy-white flowers

 
Gift Wrapping available on this plant - UK Delivery Only Gift-wrapping available
individually £12.50 each , 3+ £11.00 each 
Gift Wrapping available on this plant
PERSICARIA amplexicaulis 'Blackfield'

PERSICARIA amplexicaulis 'Blackfield'

Knotweed, Polygonum

slender flowers in deep red-black. A smouldering beauty

 
Gift Wrapping available on this plant - UK Delivery Only Gift-wrapping available
individually £13.50 each , 3+ £12.00 each 
Gift Wrapping available on this plant
PERSICARIA bistorta 'Superba'

PERSICARIA bistorta 'Superba'

Adderwort, Bistort, Polygonum

clear pink poker flowers

 
Gift Wrapping available on this plant - UK Delivery Only Gift-wrapping available
individually £12.50 each , 3+ £11.00 each 
Gift Wrapping available on this plant
 AWARD
PERSICARIA microcephala 'Red Dragon'

PERSICARIA microcephala 'Red Dragon'

Bistort, Knotweed

tall and spreading variety with dramatic brownish-red leaves with black markings

 
individually £12.50 each , 3+ £11.00 each 
Notify me when this plant is available to order
Estimated availability autumn 2024 Any time SEPT-DEC - Not yet confirmed. Could be any time between September and December.
PERSICARIA vaccinifolia

PERSICARIA vaccinifolia

Knotweed, Polygonum

tiny pink flowers, good ground cover, and excellent autumn colour

 
individually £12.50 each , 3+ £11.00 each 
Notify me when this plant is available to order
Available Early Spring 2025 - Spring according to the Met office is defined as March 1st - May 31st. Therefore early spring is early March to mid-April. This is not a guaranteed date but an estimate and subject to availability.

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

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