Description
Nierembergia – Cup Flower –
There are about 23 species of annuals, perennials, and shrubs in this genus. They occur in moist sunny habitats in temperate South America. From slender, spreading to upright stems it carries alternate, smooth edged leaves, and colorful, open cup or bell shaped, sometimes tubular flowers in summer. Most perennial species are frost tender, but are easily propagated and are often grown as annuals, use as bedding, as border edging, or in containers under glass for early spring flowers. In warm areas, grow in open sites among shrubs. Grow N. repens in a rock garden or in paving crevices, it may become invasive.
Outdoors, grow in a sheltered site in well composted, moist, but well drained soil in full sun. Under glass, grow in soil based potting mix in full light. During growth, water moderately and apply a balanced liquid fertilizer monthly. Water sparingly in winter. Trim lightly after flowering.
Prone to aphids, whiteflies, slugs and snails, and tobacco mosaic virus.
N. scoparia – N. frutescens – This shrubby perennial from Chile grows at least 18″ tall and 12″ wide. From well branch stems it carries linear to narrowly spoon shaped, stalkless leaves, to 2″ long. From mid summer to early autumn it bears numerous, tubular, pale blue flowers, to 1″ across, fading to white on the edges, and with wide spreading mouths.
Zones 7-10
