Yellow Alder (Turnera ulmifolia)

Yellow Alder

Turnera ulmifolia

Bright yellow blooms open daily at dawn, a cheerful low-growing ornamental. Flowering shrub; common names: yellow alder, ramgoat dashalong.

Full sun
2–3/week
Beginner
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Plant Needs

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Sunlight Thrives in full sun to partial shade; tolerates coastal sunlight with moderate humidity, but avoid prolonged intense midday sun in arid regions
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Watering Water when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot and fungal growth
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Temperature Prefers warm temperatures between 18–30°C; protect from frost below 10°C to prevent leaf damage
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Characteristics

  • Leaf: Oval to lanceolate with serrated margins, glossy green, and a mild aromatic scent when crushed
  • Flower: Bright yellow 5-petaled blooms, 2–3 cm in diameter, opening daily in the morning
  • Stem: Woody, densely branching, forming a rounded, bushy growth habit
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; water 2–3 times weekly

Fertilization

Diluted balanced liquid feed every 2 weeks. Cease fertilization in winter when plant growth slows to prevent nutrient buildup

Banana peel compost tea:Compost banana peels for 2 weeks, steep in water for 24 hours, and dilute 1:20 before applying as a root drench; avoid using raw peels to prevent pest attraction
Pruning
  • Trim back leggy stems in early spring to encourage compact, bushy growth
  • Deadhead spent blooms regularly to promote continuous flowering throughout the growing season
  • Remove damaged or diseased foliage promptly to maintain plant health and airflow
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic; no harmful effects for cats

Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes daily renewal due to its dawn-blooming habit, often used in pollinator-friendly garden designs

Usage: Ornamental groundcover, butterfly host plant, and low hedge for garden borders