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Buddleja davidii Purple Emperor Pyrkeep - Butterfly Bush

Buddleja x davidii Purple Emperor 'Pyrkeep'
Butterfly Bush, Summer Lilac

4,4/5
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Plant in shape, with beautiful scented flowers.

Lena, 04/10/2023

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This plant carries a 24 months recovery warranty

More information

Buddleja davidii Purple Emperor 'Pyrkeep' is a medium-sized variety, with dense foliage and a beautiful summer to autumn flowering in large purple-violet panicles. Like all other buddlejas, this deciduous bush in full bloom emits a sweet fragrance that attracts many butterflies. It easily blends into a small garden, a shrub bed, or a flowering hedge.
Flower size
20 cm
Height at maturity
1.50 m
Spread at maturity
1.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, September
Recommended planting time February to May, September to December
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Flowering time June to September
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Description

Buddleja davidii Purple Emperor 'Pyrkeep' is a compact-sized butterfly bush, with dense foliage and a beautiful summer to autumn flowering. It takes the form of large panicles of purple flowers with red-orange hearts, constantly animated with butterflies. This bush is spectacular in full bloom and has beautiful deciduous green and velvety foliage with a grey underside. Its modest size allows for easy integration into a small garden, in a shrub border, in a flowering hedge and in a container on a patio.

 

Buddleja davidii Purple Emperor 'Pyrkeep' is a deciduous bush with a spreading and compact habit belonging to the Scrophulariaceae (buddleja) family. This cultivar is derived from David's Buddleja, also known as Father David's Buddleja or Changing Buddleja, a robust Chinese species that has become invasive in our climate. 'Pyrkeep' is part of the "English Butterfly Series", a collection of cultivars selected by Elizabeth Keep, including 'Peacock', 'Adonis Blue' and 'Marbled White'. Each one is named after a species of butterfly commonly found in the UK and boasts particularly large panicles of flowers, carried on bushy and compact plants. Purple Emperor pays homage to the Purple Emperor butterfly (Apatura iris), thanks to its inflorescences of intense purple. It will reach approximately 1.5 m (4.9 ft) in height with a similar spread in 4 or 5 years. It produces sturdy, branched and arching stems that give it a beautiful bushy and open habit. It flowers from July to September, producing an abundance of dense panicles of flowers measuring 15 cm to 25 cm (5.9 in to 9.8 in) long. These flowers are purple-violet with an orange eye and release a sweet fragrance, very attractive to pollinators. Its ornamental foliage is composed of long, soft green leaves, with a greyish down on the underside. The leaves, measuring 12 cm to 20cm (4.7 in to 7.9 in) long, are pointed and lanceolate. This very hardy bush is resistant to urban pollution and does not suffer from occasional drought in deep soil.

 

Whether planted individually or in groups, in a hedge or at the back of a perennial border, Buddleja davidii Purple Emperor 'Pyrkeep' will enhance the garden. Its purple inflorescences highlight the flowers of roses in red, mauve or pink tones, as well as the colourful panicles of summer lilacs. You can also plant it in a small, informal hedge to separate themed areas in the garden. It adapts well to coastal areas and can be grown in large pots. Its fragrant flowers are also very attractive in bouquets. You can plant it alongside Japanese Spireas or with tall grasses (Miscanthus, Panicum, Deschampsia) for an elegant contrast.

Buddleja davidii Purple Emperor Pyrkeep - Butterfly Bush in pictures

Buddleja davidii Purple Emperor Pyrkeep - Butterfly Bush (Flowering) Flowering

Plant habit

Height at maturity 1.50 m
Spread at maturity 1.50 m
Habit Irregular, bushy
Growth rate fast

Flowering

Flower colour purple
Flowering time June to September
Inflorescence Panicle
Flower size 20 cm
Fragrance slightly scented, Sweet and floral fragrance
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Buddleja

Species

x davidii

Cultivar

Purple Emperor 'Pyrkeep'

Family

Buddlejaceae

Other common names

Butterfly Bush, Summer Lilac

Origin

Cultivar or hybrid

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Planting and care

It is easy to grow, as it is a low-maintenance plant that adapts to a wide range of soils and climates. It enjoys sunny spots, but also flowers in partial shade. Plant it in spring or early autumn, in ordinary soil, even limestone and poor soil, but well-worked and well-drained. Once well established, the plant will tolerate periods of moderate drought. David's buddleja has no significant enemies. However, be careful of caterpillars, weevils, and red spider mites that can invade it. Pruning vigorously after flowering and/or in early spring maintains its ramified and compact habit and encourages the bush to produce numerous flowers.

Planting period

Best planting time March, September
Recommended planting time February to May, September to December

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Free-standing, Container, Hedge
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Any
Soil type Chalky (poor, alkaline and well-drained), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, Well-drained soil

Care

Pruning instructions The bush only requires a simple pruning after flowering, or in spring. However, every 2 to 3 years, cut back the branches to maintain a compact habit and prevent the bush from "opening up". In late winter, around March-April, remove half or even two-thirds of the branches and cut away all dead wood. Buddlejas flower on new growth, so you won't risk removing future flowers.
Pruning Pruning recommended once a year
Pruning time March to April, October
Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground
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