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Some authors recommend a hard winter pruning, to as low as 6", every 2-3 years to rejuvenate plants and to promote longevity. Black Knight Butterfly Bush is an exceptionally free-flowering shrub, producing the intensely deep purple, fragrant flowers from...
- Pruning: Prune in late winter or early spring, rejuvenate with hard pruning every 2-3 years.
- Native To / Origin: Netherland Gardens - Ruy , Moerheim Nursery, Dedemsvaart, Netherlands, circa 1959
- Deer Resistance: Rarely Bothered
- Outdoor Light: Full sun, Part sun, Part shade
- USDA Cold Hardiness Zones: 5,6,7,8,9,10,11
- pH Range: Acidic, Mildly Acidic, Neutral, Mildly Alkaline, Alkaline