Centaurea ruthenica
Ruthenia knapweed
- Height × spread
- 0.8m × 1.2m
- Position
- Full sun
- Hardiness
- Colder than -20C (RHS H7)
- 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 spreading mound of long pale green stems that carry very long slender tapering dark green leaves with finely toothed edges. It makes a somewhat tangled, informal foliage mound of some character. It is mid to late summer flowering when it produces lemon yellow dandelion-lookalike flowers with linear petals, held on long pale stalks. It is a good plant to contrast with others that have an upright growth habit. This is an East European native.
- Flower colour
- Yellow
- Foliage colour
- Green
- Variegated
- No
- Scent
- No
- Shape
- Dome
- Height
- 0.8m
- Spread
- 1.2m
- Season of interest
- Summer
- Flowers in
- Summer, Autumn
- Evergreen
- Deciduous
- Garden style
- Seaside garden, Cottage garden
- Sun or shade
- Likes full sun
- Soil type
- Loam (normal)
- Soil pH
- Alkaline, Neutral
- Drainage
- Well drained soil, Dry soil, Drought resistant
- Hardiness
- Colder than -20C (RHS H7)
- Borders & containers
- Borders
- Use for
- Ground cover, Bee attraction, Butterfly attraction
- Hazards
- No
Spring
Spring-Autumn · Outdoors
Water in dry periods
Established plants in the ground can cope with 7-10 days of dryness, and shrubs often manage 2 to 3 weeks. Water one section of the garden thoroughly each day rather than a little everywhere. Check plants in pots more often, especially in hot weather.
Summer
Summer - early · Outdoors
Feed a general fertiliser
Where plants have moderate needs for nutrients, they can simply be given a general feed, fairly early in the growth season so that the growth has plenty of time to harden off before the cold weather.
Give plants a general boost with the application of a general purpose fertiliser which is spread around the root area of the plant, with amounts as directed on the feed label.
Found in
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