Formosan alder (Alnus formosana)

Formosan alder

The formosan alder is a trees up to 20 meters in height with dark gray-brown bark. The petiole is 1.2-2.2 cm, slender; leaves elliptic or oblong-lanceolate, rarely ovate-oblong, 6-12 × 2–5 cm, hairy in the axils of lateral veins beneath, almost hairless above, rounded or broadly cuneate base, irregularly minutely serrated margin, acuminate or acute apex; lateral veins 6 or 7 on each side of the midrib. It has one female inflorescence, or 2-4 in a cluster, ellipsoid, 1-2.5 cm; peduncle 3–5 mm.

Scientific classification

Species

Formosan alder (Alnus formosana)

Beeches, walnuts, and allied trees

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20 m

Plant Height

Green

Leaf Color

1 cm to 2.5 cm

Flower Size

Yellow, Red, Green

Flower Color

Deciduous

Leaf type

15 - 38 ℃

Ideal Temperature

Images of Formosan alder

Distribution of Formosan alder

Distribution Map

Formosan alder is a plant primarily native to temperate and subtropical regions in East Asia. Its range has expanded beyond its native area through cultivation for its ornamental and ecological benefits. Formosan alder's adaptation to various climates has facilitated its spread across similar environments in other parts of the world.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Riverbanks

Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Formosan alder

Twice per week

Water

Full sun

Sunlight

15 - 38 ℃

Ideal Temperature

Water: Formosan alder requires consistent hydration and thrives in damp soil, needing watering twice weekly. It flourishes outdoors in temperate climates with rainfall patterns matching its native habitat, promoting robust health and growth.

Fertilize: Formosan alder thrives on balanced nutrition fertilizers during the growing season, with high-nitrogen options in spring. Apply moderate doses quarterly, lighter for young specimens, and taper in fall. Water before application to protect roots, ensuring vigor and adaptability through mindful fertilization.

Pruning: Formosan alder is a fast-growing deciduous tree. Prune in early spring to remove dead or crossing branches, enhancing health and air circulation. Trim suckers at the base to redirect energy. Optimal timing coincides with dormancy, reducing stress and fostering vigorous spring growth.

Propagation: Formosan alder is propagated through cuttings, using semi-hardwood sections with leaves. Maintain high humidity and stable temperature for rooting, and use well-draining soil. Applying rooting hormone can enhance root development. Consistent moisture is essential, but avoid waterlogging to prevent rot.

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