Purple Haze Passion Flower Plants

• Variety: Purple Haze — white flowers with long purple filaments
• Latin name: Passiflora 'Purple Haze'
• Flower: White petals with extra-long purple filaments
• Scent: Light
• Climbing method: Tendril climber
• Height: To 7m
• Flowering: July–September
• Hardiness: H4 (–10 to –5°C)
• Evergreen: Generally evergreen in southern UK; deciduous in the north depending on winter
• RHS AGM: No
• Sold as: P9 and 3L pots. Peat-free compost
• Plant outdoors: Spring to early autumn (avoid planting in cold weather)
• Delivered: March–November typically. Collection from Castle Cary also available

Purple Haze Passion Flower – Intricate Blooms on a Vigorous Climber

Passion flower blooms are unlike anything else in the garden. Purple Haze produces large white flowers with a corona of extra-long purple filaments radiating from the centre — the effect is exotic, intricate, and slightly improbable for something growing outdoors in a British garden. Each flower lasts only a day or two, but the plant produces them in succession from July through September, and on a warm wall in a good summer, the display is continuous.

It is vigorous. To 7m, climbing by tendrils, and fast enough to cover a sunny wall or large trellis in a couple of seasons. In southern England and sheltered coastal gardens, it stays evergreen. Further north or in exposed positions, it drops its leaves in winter but regrows from the base in spring provided the roots survived. That survival depends overwhelmingly on drainage: cold and wet together kill passion flowers; cold and dry they can handle. A south-facing or west-facing wall with free-draining soil is the combination that works.

Getting the Position Right

Full sun is essential for flowering — a north-facing wall will produce leaves but few blooms. The ideal is a sheltered wall that absorbs heat during the day and radiates it back at night: brick, stone, or rendered block. Plant at the base, at least 30cm from the wall, into soil improved with grit if drainage is remotely doubtful. For a tropical-looking border, combine Purple Haze with a late-flowering clematis above and dahlias at ground level — all three need the same warm, sunny conditions and the exotic feel is deliberate.

Why Ashridge?

Every plant is guaranteed, delivered by next-day courier, and backed by our Which? Best Plant Supplier award. Somerset-based team on the phone if you need advice. Browse our passion flower range or the full climbing plant collection.

Frequently Asked Questions

Is Purple Haze passion flower hardy in the UK?

Rated H4, which means it tolerates temperatures down to about –10°C. In practice, it survives most UK winters if planted against a warm wall with good drainage. A thick mulch over the roots in autumn adds insurance. In very cold areas (Scottish Highlands, exposed northern England), treat it as a conservatory plant or grow it in a large pot that can be moved under cover.

Will Purple Haze be evergreen in my garden?

Depends on your location and the winter. South of a line from the Severn to the Wash, and in sheltered coastal gardens, it generally keeps its leaves. North of that, or in exposed inland positions, expect it to drop its foliage and regrow from the base or lower stems in spring. Either way, it comes back.

Does Purple Haze produce fruit?

It can produce small orange fruit after a warm summer, though the fruit is decorative rather than edible — a distant relative of the commercial passion fruit, but not the same species. The fruit ripens best on a south-facing wall in a long, hot summer.

How do I prune a passion flower?

In early spring, once the worst of the frosts are past. Remove any dead or frost-damaged growth and cut back side shoots to a few buds from the main framework. Passion flowers flower on new growth, so spring pruning encourages fresh flowering shoots. Do not prune in autumn — the top growth provides some frost protection for the stems beneath.