Phlox Blue Paradise

Phlox paniculata ‘Blue Paradise’ is an award-winning, herbaceous perennial celebrated for its richly coloured, fragrant flowers and excellent resistance to powdery mildew. Introduced in 1990 by renowned Dutch garden designer Piet Oudolf, it has become a favourite for summer borders, flowering reliably from July through to September.

The large flower heads open violet-blue with a dark central eye and a small white centre. Colour intensity shifts with the light, appearing bluer in the morning and evening and taking on softer purple-blue tones in full sun. The strongly scented blooms attract bees, butterflies, and other pollinators, adding both beauty and life to the garden.

Key Characteristics & Care

Flowers: Violet-blue blooms with a dark eye and pale centre
Fragrance: Sweetly scented
Height: 90–120 cm (3–4 ft)
Spread: 45–60 cm
Flowering Period: July to September
Growth Habit: Upright and sturdy

Planting Time: Spring or autumn
Position: Full sun to partial shade
Soil: Moist, fertile, humus-rich, well-drained soil

Watering: Keep soil consistently moist, especially during dry periods

Hardiness: Fully hardy (USDA Zones 4–8)
Disease Resistance: Highly resistant to powdery mildew

Usage & Growing Tips

Uses: Ideal for cottage gardens, mixed herbaceous borders, and pollinator-friendly planting
Maintenance: Deadhead spent flowers to encourage a second flush and prevent self-seeding; cut back to ground level in late autumn
Propagation: Divide clumps every 3–4 years to maintain vigour

A reliable and elegant summer perennial, offering long-lasting colour, fragrance, and excellent garden performance.