Patersonia occidentalis (Purple Flag)
Common Name: Purple Flag, Native Iris
Botanical Name: Patersonia occidentalis
Description
Patersonia occidentalis is a beautiful Western Australian native perennial with attractive strappy green foliage and striking violet to deep purple iris-like flowers. Each flower lasts for just one day, but the plant continuously produces new blooms throughout the flowering season, creating a long-lasting display. It is an excellent choice for native gardens, cottage gardens, rockeries, and waterwise landscapes.
Features
● Height: 30–80 cm
● Width: 40–60 cm
● Flower Colour: Purple, violet to blue
● Flowering Season: Late winter to early summer (August–December in Perth)
● Position: Full sun to part shade
● Soil: Well-drained sandy or loamy soils
● Water Requirements: Low once established
● Frost Tolerance: Moderate
● Drought Tolerance: Excellent once established
Growing in Perth
Purple Flag is perfectly suited to Perth’s Mediterranean climate. Plant in a sunny position for the best flowering, although it will tolerate light shade. Water regularly during establishment, then only occasionally during extended dry periods. Apply a slow-release native fertiliser in spring for healthy growth. (Kings Park and Bold Park)
Maintenance
● Remove spent flower stems to keep plants tidy.
● Divide mature clumps every 3–4 years to encourage vigorous growth.
● Avoid overwatering, especially in winter.
● Mulch lightly to conserve soil moisture while keeping mulch away from the crown.
Landscaping Uses
● Native cottage gardens
● Waterwise and low-maintenance landscapes
● Rockeries
● Mass planting for a colourful spring display
● Garden borders and pathways
● Attracts native bees and other beneficial pollinators
Why You’ll Love It
● Spectacular purple flowers
● Drought tolerant once established
● Easy-care Australian native
● Great for attracting pollinators
● Ideal for Perth gardens
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