Hibiscus syriacus 'Minomb' SUP'HEART

Hibiscus syriacus 'Minomb'
Hibiscus syriacus 'Minomb' SUP'HEART
SIZE/TYPE medium-sized shrub
 taller shrub
LEAVES deciduous broadleaf
COLOUR OF FLOWERS combined:white and deep red
BLOOMING TIME July - September
LOCATION full sun
SOIL TYPE neutral to alkaline
SOIL MOISTURE REQUIREMENTS evenly moist (dislikes drought)
USDA zone (lowest) 5   (down to -29°C)
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
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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. SUP‘HEART® is an improvement over an older variety Red Heart selected by French nursery Pepinieres Minier. It was granted an EU patent 37690 in 2014.

SUP‘HEART® Rose-of-Sharon produces snow-white, large flowers that are 10-11 cm across, and decorated with a small deep maroon eye. Some flowers have 5 but others bear 6 of them which makes them rather interesting. Flowering begins in July and lasts until all buds have gone - sometimes by end September. The plant grows into a densely branched, upright shrub. SUP’HEART® Rose-of-Sharon was awarded AGM (Award of Garden Merit) by the British Royal Horticultural Society (RHS) in 2020.

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 such that rejuvenates 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 can take drought but does not look good if dry for too long. It loves moisture fully established plants thrive on occasional flooding in summer, but you cannot transplant it into standing water. Old plants dislike peat. Selective fertilizers enhancing flowering are convenient but not crucial. Place it in full sun only. Fully hardy to min. -27 °C (USDA zone 5) and not suitable for pots.

Last update 20-09-2021

Hibiscus syriacus
Hibiscus syriacus
Hibiscus syriacus
  • 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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