About

The Acanthus spinosus Spinosissimus Group consists of clump-forming perennials characterized by deeply lobed, spiny leaves that are a rich grey-green, featuring prominent white midribs. During the summer, this plant produces tall spikes adorned with white flowers that have purple hoods. Named for its distinctive spiny leaves, this group may not yield as many flowers as some other varieties within the species.

About the genus

Acanthus consists of sturdy herbaceous perennials characterized by their lobed leaves and upright flower spikes featuring two-lipped blooms accompanied by vibrant bracts.

Growing conditions

Sunlight

Full sun, Partial shade

Soil type

Chalk, Clay, Loam, Sand

Soil pH

Acid, Alkaline, Neutral

Soil moisture

Moist but well-drained, Well-drained

Aspect

East-facing, North-facing, South-facing, West-facing

Exposure

Exposed, Sheltered

UK hardiness

H5

Plant details

Plant type

Herbaceous Perennial

Habit

Clump forming

Foliage

Deciduous, Semi evergreen

Height

1-1.5 metres

Spread

0.5-1 metres

Time to full height

2-5 years

Suggested uses

Cottage and informal garden

Care notes

Cultivation

Grow in sun or part shade, will tolerate most soils but thrives in deep loam. Acanthus need careful positioning as they can be difficult to remove once established. Has the potential to become a nuisance if not managed well

Pruning

Cut down old flower stems

Propagation

Propagate by division or by root cuttings

Pest resistance

Generally pest-free

Disease resistance

May be susceptible to powdery mildews