Corydalis HILLIER™ 'PORCELAIN BLUE'

Corydalis HILLIER™
Corydalis HILLIER™ 'PORCELAIN BLUE'
corydalis
SIZE/TYPE low perennial
 mid-sized perennial
USUAL HEIGHT 0.2-0.3m
USUAL WIDTH 0.3-0.4m
LEAVES deciduous broadleaf
COLOUR OF LEAVES +multicoloured:green a blue-green
FLOWERS showy
COLOUR OF FLOWERS sky blue
BLOOMING TIME May - June
LOCATION semi-shade to shade
USDA zone (lowest) 5   (down to -29°C)
WINTER PROTECTION  
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Perennials
Rarities
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Perhaps no other colour attracts so much attention like blue. Reason being that blue pigment used to be rare and expensive, and in some cultures the wealth of a family would be assessed by the amount of blue ornaments and objects in the house. Its natural sources were indigo (plant) and various minerals, especially lapis azuli. Cobalt salt was another one and the method to achieve it was known already to ancient Romans and Egyptians, yet its real fame came from old China when during the reign of the Tang Dynasty (7th-10th century) cobalt blue was frequently used on several types of ware, especially their true transparent porcelain which still today is a sought-after collectible. When it comes to plants, we all know that true blue flowers are in minority so we are thankful for each of them which shows some blue tint. Such as corydalis whose flowers come in several shades ranging from sky blue, brilliant blue, to cobalt blue.

HILLIER™ Porcelain Blue is a hybrid corydalis producing unique, narrowly tubular flowers in clear sky blue flowers with a bit of cobalt blue hue. They are born in erect or partly arching racemes atop about 30 cm tall slender stems. Flowering begins in May and continues for about two months. Then the plant rests for a while and in summer re-blooms with a few flowers until early autumn. Ternate leaves are deeply dissected, matte, dark green with a notable blue tint. The variety was bred by Hillier Nursery in the UK and is renowned for no summer dormancy.

Corydalis is a perennial from the forests of China. It likes partly shaded or shaded but not too dark locations. It will cope with partial or filtered sun if the ground is kept evenly moist and the plant is protected during the hottest hours of the day. The soil should be fertile, preferably evenly moist but perfectly draining as the roots might rot in wet ground. Hardy to about -29°C (USDA zone 5).

Last update: 21-05-2019
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GLOSSARY
  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
  • HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
  • FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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