Various varieties of Bougainvilleas, provide superb colour nearly all year. Jasmineperfumes early spring. Orange and Red Cannas, plus Bird of Paradise with its ‘bird head’ flowers, Angel’s Trumpet with ‘blowsy’ big peachy flowers and Hibiscus all provide lots of summer colour and diversity for butterflies and insects.
http://palmhouse.org.uk/the-plants/colourandflower/