The Cape is well known for its wealth of beautiful bulbs. If you go walking on Lion’s Head above Cape Town in early summer one of the most striking sights is Aristea. With its tall spikes of flowers, Aristea belongs to the iris family, Iridaceae. It grows wild along the lower mountain slopes of the southwestern Cape. The plants form thick clumps of long strap-shaped evergreen leaves, which stand upright to 1,5 meters. From October the flowering stems appear tall and strong above the leaves, often 8 or more stems grow from each clump. The flowers are formed along the top part of the stem, tightly arranged on little branches forming small bunches of buds. There are a few hundred flowers along each stem. The 6 bright petals of each flower open wide, creating a flat saucer of about 25mm across with the 3 yellow anthers and sword-shaped stigma in the centre. The flowers are pollinated by pollen – collecting bees that are active early in the day. The old flowering stems remain upright for months after flowering and are quite attractive, turning a rich brown colour. Underground, Aristea has a rhizome from which the plants often resprout after fire.

Introducing Aristea grandis, a stunning, robust grass-like plant with striking deep blue flowers that create a breathtaking display in any garden. Known for its tall, elegant stems and broad, pale green leaves, this member of the iris family brings a vibrant touch of colour and grace to the landscape. With its star-shaped flowers in deep blue to violet blue, contrasted by bright yellow stamens, Aristea grandis is a visual delight that blooms in dense clusters up tall stems, adding charm to any garden.

This evergreen, perennial, rhizomatous geophyte grows to a height of 700 to 950 mm and features long, narrow basal leaves that are half the length of the stem, measuring 10-16 mm in width. The flowers, borne in clusters of up to 16 blooms, appear during midsummer (December to January), creating a vivid splash of colour.

It is native to coastal grasslands in the subtropical biome, where it thrives in areas with seasonal summer rainfall and well-drained soils.
In the garden, Aristea grandis can be used as a beautiful ornamental plant or as part of a landscaping project. It is a perfect choice for a sunny, well-watered position in a frost-free environment. This species is often confused with Aristea ecklonii (blue stars), a more widespread relative that has been used in traditional medicine for treating fever, coughs, and other ailments. While there may be similar medicinal uses for Aristea grandis, it is mainly prized for its ornamental beauty.

To grow Aristea grandis, plant the seeds in well-composted, well-drained soil in a sunny spot. This beautiful plant will reward you with a vibrant display of colour while also contributing to the conservation of a species facing critical endangerment.