EVERGREEN

Plant Encyclopedia

Rhododendron kroniae ("Yorakutsutsuji")

Japanese name: ヨウラクツツジ (瓔珞躑躅)
Scientific name: Rhododendron kroniae

[Overview]
A deciduous shrub about 1 m tall, growing in forests in the mountains.
Young branches are at first sparsely covered with short white hairs.
The leaves are simple and alternate, but are often clustered at the branch tips.
The leaves are elliptical, 2–5 cm long and 1–2.5 cm wide, with short glandular hairs on the upper surface and leaf margins, and coarse hairs on the veins of the underside.
The leaf stalk is 0.2–0.5 cm long and bears a few glandular hairs.
A short inflorescence at the branch tip bears 3–10 flowers in a bundle-like cluster.
The flowers are reddish purple and tubular, about 1 cm long, with flower stalks of 1–1.5 m, and hang downward.
The corolla is 4-lobed.
There are 8 stamens.
The flower stalks are sparsely covered with short glandular hairs.
The calyx is 4-lobed, with short glandular hairs sparsely growing on the margin.
The fruit is a spherical capsule 0.3–0.4 cm long that splits into 5.

[Cultivation]
Propagate from seed.
Cuttings are also possible, although the rooting rate is poor.
It suits a well-drained, moisture-retentive site in sun to partial shade, out of the afternoon sun.
It prefers acidic soil.
For potted plants, water thoroughly when the soil surface dries; for plants in the ground, rainfall is sufficient.
Apply slow-release chemical fertilizer placed on the soil in early spring and after flowering.

[Notes]
The Japanese name likens the way the flowers hang to yoraku, the ornamental pendants of Buddhist statues and temples.

Details

Names
Japanese: ヨウラクツツジ(瓔珞躑躅)、ヨウラクドウダン(瓔珞燈台)
Life form
Shrub
Evergreen / deciduous
Deciduous
Leaf type
Broadleaf
Habit
Terrestrial
Planting (or sowing) season
February, March, April, October, November
Flowering season
May, June
Distribution or origin
Japan (central and northern Kyushu)
Growth form
Branching
Height
1000 mm
Leaf shape
Simple leaf (unlobed)
Leaf arrangement
Alternate
Leaf margin
Entire
Inflorescence
Umbel, Fascicled
Flower color
Purple
Leaf color
Green
Availability of seeds and plants
Low
Form sold
Seedlings
Propagation
Seed
Sun exposure
Full sun, Partial shade
Water needs
Moderate
Soil needs
Required
Soil acidity
Acidic
Suitable uses
Bonsai, Potted plant, Parks and gardens
Designated plants
VU: Vulnerable (Class II), Endemic to Japan
Japan Flower Trade Code
23666

Translated from our Japanese encyclopedia. If anything differs, the Japanese page is correct.

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