Persicaria macrophylla
Large-leaved knotweed, Round-flowered knotweed
Also known as Persicaria sphaerostchyus, Polygonum macrophyllum
- Height × spread
- 0.5m × 0.3m
- Position
- Full sun
- Hardiness
- Very cold to -20C (RHS H6)
- Flowers
- Summer, Autumn
Availability
Please ask in store about availability
Many plants are seasonal. Call 01234 567890 to check current stock.
About this plant
This makes a solid foliage carpet of smooth-looking large tapering leaves that have upward curved sides, emphasising their angular appearance. From the clumps arise thin green stems that carry pretty little oblong heads packed with rich pink flowers. Their character bears some resemblance to the enticing wavy-stemmed sanguisorba forms. It flowers for a long season, starting in June and going well into autumn. Good at a border front or in a gravel garden, and could be grown with sanguisorba or even alluring catanache for something different.
- Flower colour
- Pink
- Foliage colour
- Green
- Variegated
- No
- Scent
- No
- Shape
- Bell
- Height
- 0.5m
- Spread
- 0.3m
- Season of interest
- Summer, Autumn
- Flowers in
- Summer, Autumn
- Evergreen
- Deciduous
- Sun or shade
- Likes full sun, likes part shade, tolerates light shade
- Soil type
- Chalk, Loam (normal)
- Soil pH
- All types
- Drainage
- Moisture retentive soil, Well drained soil
- Hardiness
- Very cold to -20C (RHS H6)
- Borders & containers
- Borders
- Use for
- Ground cover
- Maintenance
- Easycare – low/no maintenance
- Hazards
- No
Spring
Spring - late · Outdoors
Feed with slow release fertiliser
Apply a general purpose slow release fertiliser, spreading it around the root area of the plant as it is coming into growth. (Or apply a liquid feed at regular intervals throughout the growing season.)
This is a simple way to provide a nutrient boost as a single annual procedure.
Spring-Autumn · Outdoors
Water to keep the soil moist
For best results, this plant needs soil that is always moist. Water deeply and regularly as soon as soil appears dry. Even for established plants in the ground, a dry week can cause problems with some soils. Check plants in pots more often, especially in hot weather. Or install an automatic irrigation system which will do the hard work for you, even when you are away on holiday.
Without regular watering some plants never fully regain their beauty.
Spring - early-mid · Planting
Divide when too large
The plant can be divided if it becomes too large or another plant is required. This may involve physically dividing the clump in two, removing offsets or small bulbs or dividing rhizomes. The new plants can be grown in pots or planted in the ground.
Found in
More Persicaria
Persicaria
Knotweed
Persicaria affinis 'Darjeeling Red'
Himalayan fleece flower, Knotweed
Persicaria affinis 'Donald Lowndes'
Himalayan Fleece flower
Persicaria affinis 'Superba'
Himalayan Fleece flower
Persicaria bistorta 'Superba'
Snakeweed, Mad dog skullcap, Adderwort, Red legs, Bistort, Snake root
Persicaria microcephala 'Red Dragon'
Small flowered knotweed
Persicaria 'Pink Elephant'
Knotweed, Hybrid knotweed
Persicaria affinis
Himalayan fleece flower, Knotweed