Hibiscus syriacus 'Gandini van Aart Ruby' FLOWER TOWER RUBY Rose-of-Sharon
size/type
medium-sized shrub,taller shrub
usual height
2-3m
usual width
0,5-1m
leaves
deciduous broadleaf
colour of leaves
flowers
showy
colour of flowers
blooming time
July-September
location
full sun
soil type
any (acidic to alkaline)
soil moisture requirements
evenly moist (dislikes drought)
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. The columnar-growing rose-of-Sharon originated from unnamed seedlings at the Italian nursery Gandini, where the owner showed them to Maria and Adrienne van Aart of the Dutch nursery Van Aart Boomkwekerijen in 2013. They agreed to take some plants back to Holland for further examination and propagation. After two years they selected 15 plants which gave rise to 3 beautiful varieties and later on a new series was created for them: FLOWER TOWER. FLOWER TOWER RUBY was granted these patents: EU 61269 (Europe - 2022) and PP33596 (USA - 2021).
Description of the plant:
FLOWER TOWER RUBY is an upright and slender growing variety of rose-of-Sharon with large, single to semi-full flowers. Just take a chance to see how many flowers will be single and how many will bear a few dwarf sepals in the centre, you never know at the beginning. They are bright magenta purple with a conspicuous maroon eye. They are 8-10 cm in diameter and appear from mid-July until September if the bush is strong enough. Their quantity and size is directly proportional to the age and strength of the plant. They come out reliably every year in July and don’t stop blooming until all buds have gone - sometimes by end September. It has very decorative leaves that are unique. They are shallowly 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. Slender and columnar habit of the FLOWER TOWER hibiscus makes it ideal for flowering hedges.
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 04-04-2023
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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.
