Details
'Rubra' is a clump-forming perennial up to 90cm high with deeply lobed, toothed, dark green leaves, dark red-green stems, and umbels of dark plum-coloured pincushion-like flowers surrounded by a ruff of dark red bracts from early to late summer.

Hardiness
H7 - Hardy in the severest European continental climates (< -20)

Aspect
South-facing or North-facing or West-facing or East-facing

Exposure
Sheltered

Moisture
Poorly-drained, Moist but well-drained

Soil
Sand, Clay, Chalk, Loam

pH
Acid, Alkaline, Neutral

Size
Ultimate height
0.5-1.0 metres
Ultimate spread
0.5-1.0 metres
Time to ultimate height
2-5 years

How to grow
Cultivation
Best grown in moist, fertile, humus-rich soil in sun or partial shade but will tolerate drier conditions
Propagation
Propagate by seed sown in pots in a cold frame as soon as seed is ripe or propagate by divisionin spring
Suggested planting locations and garden types
Flower borders and beds City & Courtyard Gardens Cottage & Informal Garden

How to care
Pruning
Deadhead before seed is ripe to prevent self-seeding
Pests
Generally pest free
Diseases
Powdery mildews may be troublesome