American Wisteria (Wisteria frutescens 'Clara Mack') in the Wisterias Database

Common names:
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General Plant Information (Edit)
Plant Habit: Shrub
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Wet
Wet Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 5a -28.9 °C (-20 °F) to -26.1 °C (-15 °F)
Maximum recommended zone: Zone 9b
Plant Height: 15 to 25 feet long vine
Leaves: Deciduous
Fruit: Other: usually a twisted 3 to 5 inch long brown pod
Flowers: Showy
Blooms on new wood
Flower Color: White
Bloom Size: 6"-12"
Flower Time: Late spring or early summer
Dynamic Accumulator: Nitrogen fixer
Toxicity: Other: Pods and seeds are poisonous
Pollinators: Various insects
Miscellaneous: Monoecious

vine (liana) on fence

Photo gallery:
Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-05-26vine (liana) on fence
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Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-05-26leaves and white bloom
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Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-05-26white flower clusters
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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on May 30, 2019 6:52 PM

The Kentuck Wisteria was considered as a separate species classified as W. macrostachys, but in more recent times it is considered as a variety of the American Wisteria (W. frutescens). This Kentucky Wisteria (W. frutescens macrostachys) has its pea-like flowers in more spike-like 8 to 12 inch raceme clusters and its compound leaves have about 9 leaflets and its pods are a little longer of 3 to 5 inches and are often twisted. The American Wisteria has its pea-like flowers in a more compressed raceme flower cluster of 4 to 6 inches long with 9 to 15 leaflets, and pods about 2 to 4 inches long. This cultivar of 'Clara Mack' has white flowers instead of lilac purple and was introduced to the nursery trade by Woodlanders in Columbia, South Carolina and named after a gardener in that city.

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