Details
 
N. ? faassenii is a perennial forming a clump of ascending stems bearing grey-green leaves and terminal whorls of light violet-blue flowers 12mm in length in summer and early autumn.
 
 
 
Hardiness
H7 - Hardy in the severest European continental climates (< -20)

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

Exposure
Exposed or Sheltered

Moisture
 
Well-drained

Soil
 
Chalk, Clay, Sand, Loam

pH
Acid, Alkaline, Neutral

Size
Ultimate height
0.1-0.5 metres
Ultimate spread
0.1-0.5 metres
Time to ultimate height
2-5 years

How to grow
Cultivation
Grow in any well-drained soil in full sun or partial shade. May need support
Propagation
Propagate by division in spring or autumn. Propagate by softwood cuttings in early summer
Suggested planting locations and garden types
Drought Resistant Flower borders and beds Underplanting of Roses and Shrubs Cottage & Informal Garden Wildlife Gardens Gravel Garden

How to care
Pruning
Trim after flowering to keep plants compact and to encourage a second flowering
Pests
May be attacked by leafhoppers
Diseases
May be subject to powdery mildews