Hibiscus syriacus 'Minultra' ULTRAMARINE® Rose-of-Sharon
size/type
taller shrub,taller shrub
usual height
2-3m
usual width
1-1,5m
leaves
deciduous broadleaf
colour of leaves
flowers
showy
colour of flowers
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
for zone 7
categorized
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.
Description of the plant:
ULTRAMARINE® is a striking Rose-of-Sharon variety from the breeders of Minier Nursery in France. Its large flowers are 10 cm across, deep violet blue with a typical burgundy red eye and veins in the centre. Blooming begins in early July and continues until sunny and warm days of September. Deciduous leaves are narrowly palmate, 3-lobed, mid to dark green and coarsely toothed. They emerge late so don't worry about frost damage when you don't see any growth in a spring garden that is green almost all around.Regular pruning is not necessary or even welcome. Though you can re-juvenate old plants once every 5 or 7 years but cutting off 1/3 to 1/2 of its size in spring after all frosts.
Rose-of-Sharon is quite adaptable of soil type. It likes a lot of water and if you make sure that your new plant is not put to standing water at the beginning it will be happy for occasional flooding in summer. In other words hibiscus hate drought and becomes leggy and thin at the bottom. Older plants dislike peat. Selective fertilizers for better flowering are convenient. Place it in full sun only. Fully hardy to min. -27°C (USDA zone 5).
Last update 13-08-2019
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