Nierembergia genus (Cupflower). There are about 23 species they are annuals and perennial herbs and deciduous or semi-evergreen subshrubs, They are produced in a variety of colours. The most popular garden types will bear white or purple-blue, open, cup-shaped flowers. They are frost to half hardy and will prefers sun and moist but well drained soil. Propagation is by division in spring or by semi-ripe cuttings in summer or by seeds in the autumn.
Annuals or Perennials, Shrubs
You should grow them in full sun, make sure you water well and fertilize to prolong the flowering. You can propagate the annuals from seed, the perennials by division in spring and the subshrubs from cuttings towards late summer.
Division in spring, by semi-ripe cuttings in summer or by seed in autumn.
Susceptible to aphids and whitefly under glass; slugs and snails outdoors. Prone to viruses.
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