The following is a list of tulip species and cultivars which have gained the Royal Horticultural Society's Award of Garden Merit.
[1] They are bulbous perennials, originally from sunny, open habitats in Europe and Asia.
Thousands of cultivars are available in a huge range of sizes, shapes and colours (other than pure blue).
They are usually sold as bulbs to be planted in autumn and winter for flowering in mid- to late spring.
Like many other bulbous plants they require a hot, dry dormant period in the summer.