Diana has large, pure white blossoms without the purple eye, so typical for hibiscus. This makes it a very elegant flowering shrub that is popular in Californian style where masses of green leaves come first and then attractive flowers, preferable of one colour. And white remains the top favourite.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 varigated leaves.
It has very decorative leaves that are unique. They are narrowly palmate, 3-lobed, 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, water-logged soil that might cause serious problems. Hibiscus is a typical example of a plant where the borderline between favourably moist soil (which they need) and wet soil can be tricky. Our advice is: water it well when you plant it, mulch it well and let it be well. Only when you see the leaves are drooping water it again.
I am quite surprised when I read comments about its pruning. Especially in older encyclopedias and on some West-European and American websites it is recommended to prune it every spring after frosts to encourage better flowering. Our hibiscus plants were only trimmed when they were young, and we did it before we planted them to achieve a compact shapes if the plants were delivered unsightly. Then nothing. They are located in different places throughout the garden with various soil types and quality, and they all grow relatively the same speed = medium slow (10-15 cm per year). Such short branches, however, are fully mature, woody and well branched which is a guarantee for profuse flowering the following year. If you prune your hibiscus hard, it may result in larger flowers but also in too long branches that will need to be trimmed again next year, and on and on. The only cut I suggest is when you need to reduce size of an old specimen.
Rose of Sharon is quite adaptable of soil type. As explained above it likes moist but well-drained soil, medium fertile. Older plants dislike peat. Selective fertilizers for better flowering are convenient. Place it in full sun. Fully hardy to min. -27°C (USDA zone 6, very likely 5).
Size/type: taller shrub
Usual height: 2-3m
Leaves: deciduous broadleaf
Colour of leaves: green
Colour of flowers: white
Blooming time: july - september
Location: full sun
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
155 00 Praha Stodůlky, Za Mototechnou 2673/-11