![]() Rather, they look a bit more like a lavender pinecone. First of all, their flower spikes are less than half as long, so they really don’t drip down like the Asian species. That said, it must be admitted that the North American species aren’t nearly as impressive in bloom as the Asian species. Of course, these addition flowerings are not as dense as the first wave, but who doesn’t appreciate a few extra blossoms? Moreover, both species tend to rebloom once or twice during the summer. The difference is that they bloom on new wood, that is, new stems that sprout in spring, and that means the plant can bloom even after a harsh winter. ![]() In actual fact, they are pretty much equal to Asian species when it comes to stem hardiness (USDA zone 3, AgCan zone 4), but where they shine is in their capacity to bloom after a cold winter. macrostachya), have gained in popularity over recent years as cold-climate alternatives to the Asian species. The North American species, American wisteria ( W. North American Wisterias Wisteria frutescens: while attractive in bloom, it is not really as impressive as the Asian species. sinensis ‘Caroline’, that may bloom fairly well in USDA zone 4b (AgCan zone 5b)… but only after a fairly mild winter. There are some extra hardy cultivars, such as W. For that reason, you can’t reasonably expect to get Asian wisteria to bloom reliably north of USDA zone 5b (AgCan zone 6b). And the flower buds are less hardy than the stems, so they almost always freeze where winters are cold. But they aren’t very hardy.Īlthough they will grow in USDA zone 3 (AgCan zone 4), but often freezing back severely, their flower buds are formed over the previous summer and overwinter on the plant (they bloom on old wood). Both produce long spikes of grape-scented flowers that drip down to up to 20 inches (50 cm) in length. You can tell the two apart by the direction the twining stems turn in: clockwise in the case of Japanese wisteria and counterclockwise in the case of Chinese wisteria. floribunda) and its doppelgänger, Chinese wisteria ( W. The most coveted wisterias are two Asian species, Japanese wisteria ( W. Here then are some tips that can help you succeed.Īsian Wisterias The dripping blooms of Japanese wisteria can make the mouth water. If you live north of USDA hardiness zone 4 (AgCan hardiness zone 5), you’re in the “not really a good climate for wisterias” region, but you can be successful… if you choose one of the hardiest cultivars. After all, the rarer the plant and the more impossible it is to get it to grow properly, the more you’re bound to want one! Wisteria’s refusal to flower even in mild climates is legendary in cold areas, it is even less reliable. Wisterias ( Wisteria spp.), with their dripping spikes of scented lavender blooms, are probably the most desirable of all climbing plants in colder climates… precisely because they are so difficult to get to bloom. This is not something cold climate gardeners can easily achieve. ![]() The spectacular bloom of a Japanese wisteria… in zone 8.
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