Formosan azalea - Rhododendron oldhamii (Taxonomy, Characteristics, Flower, Images)

Formosan azalea

Formosan azalea, native to Taiwan, is prized by gardeners for its attractive, deep-pink blooms in late winter and early spring. It's also a popular ornamental plant in China, Japan, and Korea. Despite its beauty, all parts of the plant are toxic to humans and animals.

Scientific classification

Species

Formosan azalea (Rhododendron oldhamii)

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Toxic to Pets

Toxicity

3 m

Plant Height

90 cm to 1.2 m

Spread

5 cm

Flower Size

Red, Purple, Pink

Flower Color

Evergreen

Leaf type

10 - 35 ℃

Ideal Temperature

Distribution of Formosan azalea

Distribution Map

Formosan azalea is native to the subtropical regions of East Asia, thriving in the evergreen forests there. While it is not widely reported as an introduced species, it has been cultivated in various parts of the world suitable for its growth requirements.

Native

Cultivated

Invasive

Introduced

No species reported

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Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Formosan azalea

Every 1-2 weeks

Water

Partial sun

Sunlight

10 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Formosan azalea originates from Taiwan's humid forests, preferring consistently moist soil and tolerating short droughts. Watering every 1-2 weeks is ideal. Often grown outdoors, it benefits from mulching to retain moisture and regulate temperature during its active growth period.

Fertilize: For optimal growth of formosan azalea, apply base fertilizer at planting. Use water-soluble fertilizers monthly during vigorous growth. Before blooming, apply phosphate fertilizer every 10 days for enhanced flowers, then switch to nitrogen after blooming. Fertilize in small amounts on dry soil, avoiding high temperatures and winter dormancy.

Pruning: Formosan azalea boasts vibrant blooms and dense foliage. Prune in early spring to enhance air circulation and light penetration. Selectively thin branches to maintain shape, promoting vigor and blooming. Use sharp, clean tools for precise cuts, reducing stress and improving overall health.

Propagation: Formosan azalea propagates effectively via cuttings. Use healthy semi-hardwood stems, making clean cuts below leaf nodes. Treat cut ends with rooting hormone and plant in well-draining medium. Maintain consistent moisture and warmth, using plastic covers for humidity until new growth appears.

Repotting: Repot formosan azalea every 2-3 years in spring to support its moderate growth. Use a wide, shallow container with well-draining acidic soil. Post-repotting, water thoroughly and provide filtered light to ease acclimatization and promote vigorous growth.

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