Hibiscus 'Resi' FULL BLAST™ hybrid rose-of-Sharon, hybrid hibiscus
size/type
small tree,taller shrub
usual height
3-5m
usual width
2-3m
leaves
deciduous broadleaf
colour of leaves
flowers
showy
colour of flowers
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)
winter protection
for zone 5+6
for zone 7
categorized
Hibiscus
We can responsibly say that today hibiscus belongs among common plants in Czech and Slovak gardens, be it woody shrubs of rose-of-Sharon (h. syriacus) or perennial hybrids of swamp hibiscus (h. moscheutos). Though, there is another hardy woody species called hibiscus paramutabilis which is quite rare in cultivation. A fine specimen is growing in the botanical garden in Linz, Austria. It has been used several times for hybridizing with h. syriacus in order to achieve larger flowers in attractive colours.Description of the plant:
Resi is a Dutch variety of hybrid hibiscus (h. syriacus x h. paramutabilis) bred by Piere Theunissen and introduced by the nursery Piet Vergeldt Boomkwekerijen in 2008. In the US it is sold under the brand name FULL BLAST™. European Patent No. 33825 was granted in 2013 (expired in 2021). It bears large, up to 8-10 cm wide, pale lilac-pink to mauve flowers with a striking magenta eye. It blooms from mid-July until September if the plant is strong and old enough to set so many flower buds. The number and size of flowers are directly proportional to the age and strength of the plant.Deciduous leaves are 8-11 cm long, distinctly divided into 3 lobes like fig leaves, medium green and matte. Same as most summer-blooming trees, they emerge quite late in spring, so don't worry about your plant if you don't see any new growth in April. Later in the season, yellowing of leaves is something that happens if newly transplanted plants are overwatered. Hibiscus loves water but must establish well first. Resi grows fast into an upright shrub of a broadly funnel-shaped habit and is often trained into standard trees because a tree packed with flowers all summer long will add interest to your garden. Or, as it can grow 30-50 % taller than h. syriacus at a faster rate, why not using it in an impressive flowering hedge?
Pruning is an issue that always gets me started here. Hard pruning leads to larger flowers, that's true, but also to production of long, immature, flexible twigs. The only time I recommend it is when you need to rejuvenate old plants – 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. -29 °C (USDA zone 5) and not suitable for pots.
Last update 31-01-2024
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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.
