This species is not very hardy in Britain, it is unlikely to succeed outdoors even in the mildest areas of the country. However, it might be possible to grow it as a half-hardy annual, to flower in its first year from seed. Seed - sow early spring in a warm greenhouse.
Germination is usually fairly rapid.
Prick out the seedlings into individual pots when they are large enough to handle. If growing them as annuals, plant them out into their permanent positions in early summer and protect them with a frame or cloche until they are growing away well. If hoping to grow them as perennials, then it is better to grow them on in the greenhouse for their first year and to plant them out in early summer of the following year. Overwinter in a warm greenhouse and plant out after the last expected frosts. The information above has been supplied solely via the hard work and dedication of the team at 'Plants for a Future'.