Plant Profile: Dietes

Fortnight Lily is a perennial plant with rhizomes that forms clusters of tall, slender leaves, typically growing between 2 to 4 feet in height. Its flowers, resembling small Japanese irises, emerge above the leaves and bloom profusely from spring through late summer, with a two-week resting period between each flowering cycle. To manage its self-seeding nature, it's advisable to deadhead the flowers.

This plant makes a striking addition as ground cover, in pots, or within rock and woodland gardens. Its grass-like appearance and delicate blooms enable it to thrive in various garden settings. Additionally, it requires minimal upkeep, making it an excellent choice for busy gardeners. In colder regions, it can be grown as an annual, or the rhizomes can be dug up and stored over winter. Potted varieties can easily be moved indoors.

When planting, space the woody rhizomes 12 inches apart, with one per square foot, and bury them to a depth of 1 inch (2.5 cm). They are sensitive to temperatures below 50°F (10°C) but can withstand drought conditions.

The primary pest concern for this plant is nematodes, while scales can infest the foliage and lead to significant issues.