Gardens Illustrated Magazine

PLANT PROFILE

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What A diverse genus of more than 400 species of annuals, perennials and shrubs. The more coldtolera­nt species have been greatly important to the developmen­t of ornamental cultivars. These x speciosa hybrids exhibit a vibrant range of colours from white, blue and deep purple through to vibrant red, and tend to send their flowering stems up 40cm to 1.2m above fleshy, evergreen rosettes.

Origins Most are concentrat­ed in tropical or warm temperate regions but a few extend their range into cool temperate zones. Season The most popular hybrids flower from mid-July until well into September. Size There is a wide range in size from the tall and shrubby to diminutive, sprawling species with wiry stems. Conditions The most popular cultivars tolerate sun or partial shade but require consistent­ly moist soil in the summer. They are best kept slightly drier through the colder months, in a sheltered position or in a dry mulch to protect them from frost. Hardiness Generally hardy, RHS H3-H5. The North American Lobelia siphilitic­a is one of the hardiest, coping with temperatur­es down to –10°C (RHS H4, USDA 8a-9b).

*Holds an Award of Garden Merit from the Royal Horticultu­ral Society. †Hardiness ratings given where available.

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