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Paulownia 'FAST BLUE'

Paulownia 'FAST BLUE'

Princess tree 'FAST BLUE'

synonym Paulownia fortunei 'Minfast'
Paulownia fortunei 'FAST BLUE'

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Description

Paulownia ‘FAST BLUE’ (Princess tree ‘FAST BLUE’, synonym Paulownia fortunei ‘Minfast’) was selected as a cultivar of Paulownia fortunei by French breeder Patrick Pineau of Minier nursery. Paulownia fortunei is, however, only moderately hardy and because cultivar ‘FAST BLUE’ is most likely a hybrid, species name fortunei is less appropriate in this case. Paulownia ‘FAST BLUE’ has an upright pyramidal crown up to eighteen metres tall and between ten and twelve metres wide, the crown is not as irregular as that of Paulownia tomentosa and the branches are more erect. 

In April, Paulownia ‘FAST BLUE’ bears large, intense blue-violet, bell-shaped to trumpet-shaped flowers in large erect panicles. They are smaller and bloom three weeks later than those of Paulownia tomentosa but they too are easily found by bees. The flowers fade to white before the egg-shaped, pointed seed capsules with winged seeds appear. Also, the leaf of cultivar ‘FAST BLUE’ is rather smaller than that of Paulownia tomentosa but recognisably heart-shaped, 3-5-lobed and still very sizeable. The foliage emerges grey-green and changes to green in summer. Princess tree ‘FAST BLUE’ has a slightly grooved, grey-brown bark and hollow stems covered with lenticels.

Paulownia ‘FAST BLUE’ has a more upright habit than Paulownia tomentosa and is consequently better suited to broad avenues. Its great heat resistance, rapid growth and high ecological value make this princess tree useful for cities, provided it is given a substrate very well suited to improving the habitat of trees and preferably plant the tree not too close to buildings on account of its extensive, fleshy root system. Cultivar ‘FAST BLUE’ tolerates a wide range of soils and even grows too vigorously on clay-rich and nutrient-rich soils which can lead to breaking branches. Tolerant of a degree of wind, it is better to plant Paulownia ‘FAST BLUE’ however in a sheltered and sunny site for best possible growth and blossom.

Types of planting

Tree types

standard trees multi-stemmed trees shade trees

Use

Location

avenue square park central reservation large garden cemetery

Pavement

none none

Characteristics

Crown shape

wide pyramidal wide pyramidal

Crown structure

semi-open semi-open

Height

12 - 18 m

Width

10 - 12 m

Winter hardiness zone

6B - 9B

Aspects

Wind

slightly tolerant to wind

Soil

loess sabulous clay light clay sand loamy soil

Nutrient level

low in nutrients moderately rich in nutrients

Soil moisture level

dry moist

Light requirements

sun

pH range

acidic neutral alkaline

Host plant/forage plant

bees

Extreme environments

tolerant to dryness tolerates air pollution tolerates heat

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Photos

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high-stem standard tree
Paulownia 'FAST BLUE' standard tree
high-stem standard tree
Paulownia 'FAST BLUE' standard tree
high-stem standard tree
Paulownia 'FAST BLUE' standard tree
high-stem standard tree
Paulownia 'FAST BLUE' standard tree
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
flowers flowers
Paulownia 'FAST BLUE' flowers
leaves leaves
Paulownia 'FAST BLUE' leaves
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
bark bark
Paulownia 'FAST BLUE' bark
twigs twigs
Paulownia 'FAST BLUE' twigs
twigs twigs
Paulownia 'FAST BLUE' twigs
twigs twigs
Paulownia 'FAST BLUE' twigs
twigs twigs
Paulownia 'FAST BLUE' twigs

Flowers

Flowers

raceme corymbose bell-shaped trumpet-shaped striking standing big scented

Flower colour

blue-violet

Flowering period

April - May

Leaves

Leaf colour

green buds grey-green

Leaves

deciduous cordate big opposite lobate

Fruits

Fruit colour

brown

Fruits

striking winged capsule

Bark

Bark colour

grey-brown

Bark

slightly furrowed

Twigs

Twig colour

brown

Twigs

bare with lenticels vertical branches long shoots

Root system

Root system

deep fleshy roots

For and by green professionals

The TreeEbb is a platform for and by green professionals, in which we collect knowledge and experience from the sector and make this available for users. All the details and photos are free to use for non-commercial purposes. Want to share your tree knowledge? Send photographs and additional information to treeebb@ebben.nl

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Winter hardiness

A plant's winter hardiness is the coldest area in which it is frost-resistant. This is based on the average annual minimum temperature. Winter hardiness zones are thirteen different frost zones in steps of 5.5 degrees Celsius. This format is an international standard for the hardiness of plants. The zones in which the plant is frost-resistant are always included in the description of trees and other vegetation.

Winter hardiness is a genetic characteristic and is not influenced by the location in which the plant is cultivated. This means that a plant that has been cultivated for many years in winter-hardiness zone 6 but has a winter hardiness of 3 is perfectly suited for replanting in a colder zone. It will thrive there thanks to its genetic characteristics.

When choosing planting for a project, the winter hardiness of the plants is extremely important. By choosing species that match the zone in which the project is being created, it is possible to ensure that plants can withstand the minimum temperature in that area.

Winter hardiness map
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