Butterfly Bush, Summer Lilac, Orange-eye Butterfly Bush 'Blue Horizon'

Buddleja davidii

Family: Buddlejaceae
Genus: Buddleja (BUD-lee-uh) (Info)
Species: davidii (duh-VID-ee-eye) (Info)
Cultivar: Blue Horizon

Category:

Shrubs

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round

Suitable for growing in containers

Height:

4-6 ft. (1.2-1.8 m)

Spacing:

4-6 ft. (1.2-1.8 m)

Hardiness:

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

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

Sun to Partial Shade

Danger:

N/A

Bloom Color:

Blue-Violet

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Mid Fall

Foliage:

Deciduous

Other details:

May be a noxious weed or invasive

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

From woody stem cuttings

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

Gardeners' Notes:

0
positives
1
neutral
0
negatives
RatingContent
Neutral

On Aug 2, 2016, coriaceous from ROSLINDALE, MA wrote:

The RHS assessed this cultivar in 2010 and recommended it for the coveted Award of Garden Merit. "Nice blue and good tight habit. Distinct. Has everything going for it. Average inflorescence size 44x5cm. Height and spread 270x260cm."
http://apps.rhs.org.uk/planttrials/TrialReports/Buddleja 201...

Like all B. davdii cultivars, this requires weekly deadheading for it to look and bloom its best.

Buddleias are fairly short-lived shrubs, 5-10 years is common.

In some places, B. davidii can be an invasive weed: England, France, New Zealand, and the states of Oregon and Washington. It has naturalized in eastern N. America but is not con... read more

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