Best known for their tall spikes of beautiful flowers, this group of both annuals and perennials range in height from 30 cm to 2 m high depending on the species. The flowers are borne in spring and summer in a range of colours including pale or deep blues, purples, whites or lilacs. Plant Delphiniums in an open airy position in full-sun in moist, fertile, well-drained soil. The 'Butterfly' delphinium and the species grandiflorum are popular cut flowers.