Photo by Melody

PlantFiles: Butterfly Bush, Summer Lilac
Buddleja 'Summer Skies'

Family: Buddlejaceae
Genus: Buddleja (BUD-lee-uh) (Info)
Cultivar: Summer Skies
Additional cultivar information: (PP22465, CBRAF)


5 vendors have this plant for sale.


Unknown - Tell us

4-6 ft. (1.2-1.8 m)

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

Pollen may cause allergic reaction

Bloom Color:

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


Other details:
This plant is attractive to bees, butterflies and/or birds
Flowers are fragrant
Drought-tolerant; suitable for xeriscaping
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:
Unknown - Tell us

Propagation Methods:
From softwood cuttings
From semi-hardwood cuttings

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By Clary
Thumbnail #1 of Buddleja  by Clary

By Clary
Thumbnail #2 of Buddleja  by Clary


1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive Clary On Aug 20, 2012, Clary from Lewisburg, PA (Zone 6b) wrote:

I have had this plant in the garden for two months. During this time it has doubled in size and is flowering beautifully. The flowers are indeed violet - slightly more purple than a typical english lavender. They are nicely shaped in pointed panicles and very full. The shape of the bush is round and full. The foliage color is outstanding. It is variegated with lemony cream and light green which looks wonderful with other plants.


I have removed all my buddleias except the Lochinch. All but the Lochinch had become infested with mildew. I don't know if it's the weather these past years or the density of buddleias, but I suspect both have contributed. I noticed the mildew last year and cut them all to the ground. This spring, the lochinch was the only one that produced healthy leaves. I dug out all the others, including the summer skies.

There are far too many buddleias in my region. There are probably 10-12 buddleias *per block* throughout my town. I've noticed that butterflies, hawk moths, and even hummingbirds no longer attend to other nectar flowers - only the buddleias. Additionally, many people don't prune or care for their gardens and most of these buddlieas have grown enormous - and all have wrinkling grey mildewed leaves. So I think that this mildew blight is being spread throughout my region.

I removed my plants because I feel it is irresponsible (and unattractive) to keep a diseased plant. I replaced them with native milkweeds and a few other nectar flowers, hoping to provide more options for wildlife and to prevent the spread of mildew.


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

Lewisburg, Pennsylvania

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