Buddleja longifolia
Plant Abstract

Known as- Buddleja
Grow Zone - 6 to 9
Type- Deciduous shrub
Familial- Loganiaceae
Smith Scl. hardy? No
Geography- Northern South America
ht.- 4 to 5 ft.
Span- 4 to 5 ft.
Coloring- Lilac blue
Shade/Light- Full sun
Moisture- Medium dampure
Hi/Lo Maint- Low
Grow in average, moderate wet, well-drained soil in full sun. Becomes weedy and sparse with diminished flowering performance if not grown if full sun. Does poorly in wet conditions. This species is only recommended for growing in Zones 6-9. Therefore, in order for this plant to survive the winter in the St. Louis area (Zone 5), it should be grown as an herbaceous perennial with extra protection (e.g., grow in a protected place in the garden and apply a heavy winter mulch). Cut back to the ground in late winter to early spring. Removal of spent flower spikes will encourage additional bloom, but final blooms may be left to facilitate reseeding.
This buddleja is a moderate sized, deciduous shrub with an arching, mounded habit growing 4-5” tall. Gray-green leaves are long and pointed (acuminate). Spike-like, terminal clusters of lilac blue flowers bloom from July to September. Flowers are very attractive to butterflies. Popular fresh cut flower. Will grow taller in the South (10-12”) where it does not die to the ground in winter, but still may be pruned almost to the ground there each year since it seems to flower best and form can be better controlled when it is severely cut back.
No serious insect or disease problems.
Common Applications-
Provides valuable late summer to early fall flowers when few other shrubs are in bloom. Best grown in massed plantings as background in the perennial border, mixed shrub border, rose, cottage or butterfly garden. Usually does not make a good single specimen shrub.

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