Rhododendron 'SIMSON' rhododendron
size/type
medium-sized shrub,medium-sized shrub
usual height
1,5-2m
usual width
1,5-2m
leaves
evergreen broadleaf
colour of leaves
flowers
showy
colour of flowers
blooming time
May-June
location
full to partial sun
USDA zone (lowest)
7 (down to -23°C)
winter protection
for zone 5+6
for zone 7
categorized
Rhododendrons are reliable, beautifully flowering, evergreen shrubs of variable origin: S.W. China, Himalayas, Northern America, and even Europe. The original species were hybridized several times for better performance so in the 1950´s there were more than 10,000 cultivars registered, and the number keeps increasing.
Description of the plant:
Simson rhododendron is a result of multiple hybridization where possibly the key parent was a Chinese wild form r. wardii from S.E. Tibet and N.E. parts of Yunnan province. Further crossing with hardier species and varieties significantly increased hardiness of this variety as well as improved its flower colour. The open bell-shaped flowers are medium to light yellow without a blotch on the upper lip. Evergreen leaves are flat, medium to olive green, and matte. Simson is popular also for its faster growth rate than most yaku hybrids with yellow flowers. It grows at moderate growth rate into quite a symmetrical, almost cushion-like but upright shrub, about 1.2-1.5m tall and wide in 10 years. Bred by Hans Hachmann in 1989.For a better looking plant dead-head where possible. The roots are shallow, spreading to sides in search for nutrients. Never plant them too deep. The soil has to be acidic (pH 4.5-5.5), rich in humus, cool and always moist. Ideal soil mixture is peat with lime-free, light garden soil topped with leave-mould. Hardy to min. -23°C (USDA zone 6).
Last update 23-11-2017
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