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This is a close look at the rare Passiflora mathewsii alba from the cool mountains of Peru. This attractive vine is covered with graceful, pure-white blossoms that are displayed horizontally from the vine. Their cup shaped corolla somewhat resembles a tulip on a long tube. They appear non-stop from spring through autumn. Unfortunately the plant is probably heat-sensitive, so it might not be suitable for gardeners in warm climates. This form is very rare in cultivation. I don't know anyone currently offering seeds.
It is a vigorous, spreading vine, although it may be pruned to a small size if desired. It makes a dense mat of attractive leaves that would look great along a trellis or arbor. The flowers of most other Passifloras in the subgenus Tacsonia hang downward, but these are held sideways, for ease of access to bees & butterflies. The blooms are 3 to 4 inches long including the tube. After flowering, it makes fragrant, oval fruit that is both tart and sweet. The plant may be cross-bred with some related Passifloras to create new hybrids.
It comes from higher elevations in the Andes mountains, where temperatures are mild or cool all year, and nights are cool. I don't know anyone growing it in a warm climate, but related Passifloras tend not to flower when temperatures rise above the low 80s (28°C). It might not thrive in consistently hot conditions, particularly if nights are warm (above 65°F / 18°C). I don't know if it can tolerate frost. It likes mostly-sunny conditions. Some afternoon shade may be needed in warmer climates. Like most Passifloras, it enjoys fertile, well-draining soil that's kept evenly moist. Over about 40% humidity is best. In the right conditions, it's an easy vine.
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