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Alternanthera dentata 'Purple Knight'


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Key information

Plant type

Half-hardy annual


Dramatic foliage



Skill level


photo by Thomas Alamy, copyright GAP Photos (253875)

Plant details

As tropical gardening has increased in popularity, so too has this striking, dark purple-leafed plant. It has vigorous, upright and spreading purple leaves and stems that arch over the edge of containers and are excellent when used as mid-height bedding in a summer border. The plant will grow in both sun and shade but it performs best and has darkest foliage in full sun. It can also be grown from seed: sow the seeds indoors about 10-12 weeks before the last frost date.

Genus: Alternanthera

Species: dentata

Cultivar: Purple Knight

Plant type: Half-hardy annual

Foliage colour: Purple

Feature: Dramatic foliage

Sun exposure: Full sun

Soil: Well-drained/light

Hardiness: Tender

Skill level: Experienced

Height: 50cm

Spread: 50cm

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