Hibiscus syriacus (syn. 'Blue Bird') 'OISEAU BLEU'

Hibiscus syriacus (syn. 'Blue Bird')
Hibiscus syriacus (syn. 'Blue Bird') 'OISEAU BLEU'
rose-of-Sharon
SIZE/TYPE medium-sized shrub
USUAL HEIGHT 2-3m
USUAL WIDTH 1-1.5m
LEAVES deciduous broadleaf
COLOUR OF LEAVES green
FLOWERS showy
COLOUR OF FLOWERS violet
BLOOMING TIME July - September
LOCATION full sun
SOIL TYPE neutral
SOIL MOISTURE REQUIREMENTS tolerates (but does not demand) wet ground
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 Deciduous broadleaf
Summer blooms
Hedging plants
náhled fotonáhled fotonáhled foto
Rose-of-Sharon deserves more attention for its abundant flowering in summer. These maintenance-free shrubs come from eastern Asia and are the inevitable ingredient of every summer garden which they highlight with a wide range of coloured flowers. There has been a number of cultivars available since its discovery. They have various bloom colours, shapes and sizes, as well as variegated leaves.

This Rose-of-Sharon variety has a French name Oiseau Bleu which was difficult enough to be replaced with an English translation Blue Bird. It had long been the only blue variety in trade until Marina (BLUE SATIN™) appeared in 1996, and in 2007 a much deeper blue variety from France named ULTRAMARINE® took its place. However, Blue Bird is still very demanded for its attractive, pastel lavender blue flowers that are about 6-8 cm across and decorated with a large maroon eye in the centre. It looks great both on its own, or combined with other varieties of contrasting flower colours(s). Flowers come out in profusion in early July and don’t stop blooming until all buds have gone - sometimes by mid or late September. The plant grows into a densely branched, upright shrub.

It has very decorative leaves that are unique. They are deeply lobed, palmate, mid to dark green and coarsely toothed. If they turn yellow in summer the plant manifests too much water at the roots. They are either over-watered or planted in too heavy soil where it has not established yet.

Pruning is an issue that always gets me started here. Hard pruning leads to larger flowers, that's true, but also production of long, immature, flexible twigs. The only cut I recommend is to rejuvenate old plans - prune it hard in early spring by 50-75% and let it grow for another 10 years or so.

Rose-of-Sharon is quite adaptable of soil type. It likes sufficient moisture and but you cannot transplant it into standing water. When fully established it will love occasional flooding in summer. Older plants dislike peat. Selective fertilizers for better flowering are convenient but not crucial. Place it in full sun only. Fully hardy to min. -27°C (USDA zone 5). Not suitable for pots.

Last update 10-06-2007; 08-03-2021
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Hibiscus syriacus (syn. 'Blue Bird') height of stem 170-180 cm, girth 10-12 cm
STANDARD
CHLUMEC BY CAR
Hibiscus syriacus (syn. 'Blue Bird') height of stem 170-180 cm, girth 10-12 cm
STANDARD
PRAGUE BY CAR

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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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