Passiflora caerulea

Passiflora caerulea, commonly known as the Blue Passion Flower, is a magnificent and surprisingly hardy climber that originates from South America. We absolutely adore its unique, star-like flowers, which feature pristine white petals beautifully contrasted with an intricate central corona of blue, white, and deep purple filaments. It’s a real showstopper, blooming profusely from mid-summer well into autumn, and it’s no wonder it holds the prestigious RHS Award of Garden Merit. While it’s largely semi-evergreen in milder parts of the UK, keeping much of its lush, deeply lobed foliage through winter, in colder spells, it may shed its leaves, only to burst back with fresh growth each spring.

To ensure your Blue Passion Flower thrives, we recommend planting it in a sheltered, sunny spot – a south or west-facing wall or fence is ideal for encouraging the most prolific flowering and the best chance of those ornamental fruits. It appreciates moist, but well-drained soil that’s rich in organic matter; it’s quite adaptable and will happily grow in chalk, loam, or sand, tolerating a range of pH levels. Water freely during the growing season, especially when establishing, but reduce watering significantly in winter. This vigorous beauty is hardy across most of the UK (RHS H4), capable of withstanding temperatures down to -10°C to -15°C once established, often regrowing from the base even after a harsh winter.

Pruning is best carried out in late winter or early spring, just as new growth begins. Simply cut back any old, flowered stems and remove dead or damaged growth to maintain its shape and encourage a fresh flush of blooms. Being a tendril climber, it will need a sturdy support such as a trellis, wires, or a pergola to scramble over. Beyond its exquisite flowers, warm summers will often see it adorned with decorative egg-shaped orange fruits, which, while edible, are quite bland so are best left for visual appeal. It’s a fantastic choice for adding an exotic touch to a cottage garden or creating a lush, green screen, attracting pollinators like butterflies and bees throughout the summer months.