Nierembergia caerulea

Cup flower

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Key information

Plant type

Hardy annual

Flower colour






Skill level


photo by Marcus Harpur, copyright GAP Photos (76250)

Plant details

This is a variety of an Argentinian species, in old reference books called N. hippomanica var. violacea, but whereas the species is an upright tender perennial, modern varieties are low-spreading plants grown as half-hardy annuals. They are perfect for edging beds and paths, restrained enough to grow in a rock garden, and also suitable for edging large containers or potting up for indoor display. Flowering is prolific in a sunny position, and continuous right up to the autumn. Since plants are perennial, it is worth potting up a few in autumn to keep indoors. The Royal Horticultural Society has given it its prestigious Award of Garden Merit.

Family: Solanaceae

Genus: Nierembergia

Species: caerulea

Plant type: Hardy annual

Flower colour: Blue

Feature: Flowers

Sun exposure: Full sun

Soil: Well-drained/light

Hardiness: Hardy

Skill level: Beginner

Height: 20cm

Spread: 20cm

Time to plant seeds: September to May

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