About
Diamond Lake' is a prostrate evergreen sub-shrub with rounded blue-green leaves and narrowly bell-shaped pink flowers 3.5cm long in late spring and early summer.
About the genus
Penstemon may be deciduous or evergreen perennials or subshrubs, with simple, narrow leaves and racemes or panicles of bell-shaped or funnel-shaped flowers in summer and early autumn
Growing conditions
SunlightFull sun, Partial shade
Soil typeChalk, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureWell-drained
AspectWest-facing, South-facing, East-facing
ExposureExposed, Sheltered
UK hardinessH5
Plant details
Plant typeHerbaceous Perennial
HabitBushy
FoliageEvergreen
HeightUp to 10 cm
Spread0.1-0.5 metres
Time to full height2-5 years
Suggested usesCity and courtyard gardens, Coastal, Rock garden, Cottage and informal garden, Gravel garden, Patio and container plants, Wildlife gardens
Care notes
CultivationGrow in poor to moderately fertile, very gritty, well-drained soil in full sun. In cold areas, protect plant overwinter with a dry winter mulch. See penstemon cultivation for further advice
PruningDeadhead after flowering to maintain vigour
PropagationPropagate by softwood cuttings in early summer or semi-hardwood cuttings in midsummer. Propagate by division in spring
Pest resistanceMay be susceptible to slugs, snails and chrysanthemum eelworms
Disease resistanceMay be susceptible to downy mildews