About
Heuchera cylindrica, the roundleaf alum root, is an evergreen perennial forming low, dense mounds of oval to heart-shaped, scallop-edged leaves to 6 cm across. In late spring and summer, small, yellow-green to creamy-white flowers are borne in tight clusters on upright stems to 80 cm. A bold and reliable heuchera for a partly shaded border.
About the genus
Heuchera are evergreen or semi-evergreen, clump-forming perennials with rounded, palmately lobed leaves and wiry-stemmed racemes or panicles of small, tubular flowers in summer. Popular as much for their ornamental foliage as their flowers, they excel as ground cover in shaded borders.
Growing conditions
SunlightFull sun, Partial shade
Soil typeLoam, Sand
Soil pHAlkaline, Neutral
Soil moistureMoist but well-drained
AspectEast-facing, North-facing, South-facing, West-facing
ExposureExposed, Sheltered
UK hardinessH6
Plant details
Plant typeHerbaceous Perennial
HabitBushy
FoliageEvergreen
Height0.5-1 metres
Spread0.1-0.5 metres
Time to full height2-5 years
Suggested usesCity and courtyard gardens, Coastal, Cottage and informal garden, Patio and container plants, Rock garden
Native toWestern N America
Care notes
CultivationGrow in a fertile, moist but well-drained, neutral soil in sun or partial shade. The woody rootstock tends to lift out of the ground so mulch annually or lift and replant
PruningRemove faded flower spikes
PropagationPropagate by seed or by division
Pest resistanceMay be susceptible to vine weevils and mealybugs
Disease resistanceMay be susceptible to heuchera rust