Photo by Melody

PlantFiles: Buddleia, Buddleja
Buddleja longifolia

Family: Buddlejaceae
Genus: Buddleja (BUD-lee-uh) (Info)
Species: longifolia (lon-jee-FOH-lee-uh) (Info)

Synonym:Buddleia longifolia

View this plant in a garden


4-6 ft. (1.2-1.8 m)

36-48 in. (90-120 cm)

USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun


Bloom Color:

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall
Blooms repeatedly


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
From semi-hardwood cuttings
From hardwood cuttings
From hardwood heel cuttings
Allow cut surface to callous over before planting

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds


No positives
3 neutrals
1 negative

Gardeners' Notes:

Neutral D3J3 On Aug 25, 2014, D3J3 from Lansing, MI wrote:

I love this plant, especially the bees and butterflies that are attracted to the flowers - but I have not had any success getting it established. The plants do not survive the winter.

I know it grows in this area as my bosses wife has a beautiful 'Dark Knight' and last week I was detoured due to road constructions and passed a yard with four large specimens of different colors... I am not sure what they are doing right and I am doing wrong...

Neutral warwick3md On Jul 17, 2005, warwick3md from Catonsville, MD (Zone 7b) wrote:

This shrub can become very large. I may not have pruned it at the proper time last year as the blooms are very sparse-actually barely growing. This particular schrub is about 4 years old &usually very nice so I can only attribute it's lack of buds to my improper pruning.

Negative lupinelover On Jan 10, 2003, lupinelover from Grove City, OH (Zone 6a) wrote:

The leaves are much sparser on this species than on the more familiar davidii hybrids, giving it a somewhat weedy appearance without continual pruning/deadheading.

Neutral smiln32 On Aug 31, 2001, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

This buddleja is a medium 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.


This plant has been said to grow in the following regions:

Catonsville, Maryland
Dewitt, Michigan
Lansing, Michigan
Rock Hill, South Carolina

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America