The Buddleia davidii group include many cultivars each with its own merits. As a species they prefer lean soils and positive drainage, and if happy they will self-seed I frequently have many seedlings popping up in the gravel driveway each summer and will leave the odd one to see what happens. In severe winters the plants may experience winter dieback where the plants may fail to re-sprout in the spring. They are perennial but if treated as an annual you will not be dissapointed if they fail over the winter. That said I have not lost one in the garden for the past six years.This is considered a invasive plant in some areas so use with caution where cold winers may leave them unchecked.
|USDA Hardiness Zone
|Canadian Hardiness Zone
|4 - 6a
|RHS Hardiness Zone
|-29 - (-23)
|-20 - (-10)
|A somewhat ungainly shrub, that is very attractive in flower but not so when out of bloom.
|Cottage gardens and drought resistant borders.
|Easy to grow on positive, well drained, lean soils. Should only be pruned after new growth emerges in the spring.
|Large unkempt shrub.
|Identified by their large panicles and the end of the branches.
|Thickets on mountain slopes, limestone outcrops, forest clearing, and rocky stream banks.
|Light beige, somewhat papery in texture, many stems usually not exceeding 10cm in diameter.
|Flower/Leaf Bud Description
|Naked, 2 scaled, grayish brown, pubescent.
|Opposite, simple, ovate-lanceolate 10-25m long, acuminate, closely serrate.
|Perfect, usually lavendar, 4 petaled, fragrant,
|Gray green leaves appear in late spring and are retained until late autumn.
|Great Flat Lode, Redruth, United Kingdom.
|Seed requires no pretreatment, cuttings collected from May to June root easily, winter hardwood cuttings can be rooted. I have noticed in my gravel drive that there are many seedlings each year that require execution.