Details
H. vernicosa is a rounded shrub of compact habit, with small, very glossy dark green leaves and axillary racemes of small white or very pale blue flowers in early summer
 

 
 
Hardiness
H4 - Hardy through most of the UK (-10 to -5)
 
 
Aspect
North-facing or East-facing or South-facing or West-facing

Exposure
Sheltered

Moisture
Well-drained, Moist but well-drained
 
 
Soil
Sand, Clay, Chalk, Loam

pH
Alkaline, Neutral

Size
Ultimate height
0.1-0.5 metres
Ultimate spread
0.5-1 metres
Time to ultimate height
5-10 years

How to grow
Cultivation
Grows well in poor to moderately fertile soil in sun or partials shade with protection from cold, drying winds. Tolerant of some pollution and can also be grown in a cool glasshouse in a loam-based compost with shade from hot sun
Propagation
Propagate by seed sown in containers in a cold frame as soon as ripe. Cultivars will not come true. Root semi-hardwood cuttings in late summer or autumn with added bottom heat
Suggested planting locations and garden types
Banks and Slopes Flower borders and beds Ground Cover Wall-side Borders City & Courtyard Gardens Coastal Cottage & Informal Garden Patio & Container Plants Rock Garden

How to care
Pruning
Pruning group 9
Pests
Aphids may be a problem
Diseases
A leaf spot and a downy mildew may be a problem

Info. courtesy of the RHS