Header image: A greenhouse filled with petunias engineered to glow continuously by the biotech start-up Light Bio. Image credit: LIGHT BIO INC.
27.08.2024 - 18:41 / finegardening.com
When it comes to perennial vines, it’s hard to top the beauty of blue passion flower (Passiflora caerulea, Zones 7–11). This South American native plant is well-suited for the heat and humidity of the southeastern United States. One of the hardiest passion vines, it will reliably overwinter in Zone 7, or even Zone 6 when provided with extra winter protection. Learn more about choosing the right passion flower vine for your garden here.
This dense, vigorous vine can easily grow 20 feet tall and 6 feet wide. Its sensitive, coiling tendrils, like those of pea plants, help it latch onto and climb up structures in search of the sun. The more sun it gets, the more blooms it produces. From early summer to early fall, the vine is laden with multitudes of pale, starburst-shaped flowers topped by vibrant indigo crowns and large, golden anthers. Popular in cultivation, a number of colorful cultivars exist, including ‘Waterloo Blue’.
The fruit of this vine is edible when it ripens to a beautiful orange color, although if you’re only growing it for the fruit, you may be disappointed. Its tart taste is less appetizing than the widely available common passion fruit (Passiflora edulis, Zones 10–12). Plus, there’s often a high seed-to-pulp ratio, which promises more effort than it’s worth. All other parts of the plant, including the unripened fruit, are reported to be toxic.
Blue passion flower will easily thrive in most sunny, well-draining sites when given a sturdy support, but there are a few things to consider before introducing it to your landscape. First, like other kinds of Passiflora, blue passion flower forms a large root system that can sucker many feet from its original planting site. If routine sucker removal sounds like too
Header image: A greenhouse filled with petunias engineered to glow continuously by the biotech start-up Light Bio. Image credit: LIGHT BIO INC.
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