Cat's Whiskers (Orthosiphon aristatus) Care: Tropical Beauty with Medicinal Tea

Cat’s whiskers (Orthosiphon aristatus) is a tropical perennial shrub from Southeast Asia, southern China, and northern Australia. Its glossy, serrated leaves and spikes of white or mauve flowers with long, whisker-like stamens give it a distinctive appearance. In Indonesia and Malaysia, it’s known as kumis kucing and misai kucing; its dried leaves make Java tea, a traditional remedy for kidney stones. Hardy in USDA zones 9–11 (20–30°F minimum), it grows 3–4 feet tall and wide, blooming summer through fall. Attracts bees, butterflies, and hummingbirds.

Quick Profile

• Family: Lamiaceae
• Height/Spread: 3–4 ft / up to 3 ft
• Flowers: White, blue/mauve; summer–fall
• Light: Full sun to partial shade
• Soil: Well-drained, neutral to mildly acidic
• Water: Keep moist; deep watering; never waterlogged
• Fertilizer: Balanced liquid; spring through summer
• Propagation: Softwood cuttings
• Maintenance: Low

Growing Instructions

Light and Temperature

Full sun maximizes blooms; tolerates dappled shade. Must have some direct sun daily. Hardy to 20°F (zones 9–11). In cooler zones, grow in containers and overwinter indoors.

Watering

Water thoroughly to reach roots. Keep soil consistently moist but not soggy. Increase frequency in dry spells. Never let soil dry out completely.

Soil and Fertilizer

• Well-drained soil. For beds: spread 3″ compost, incorporate 6–8″ deep.
• Apply 1 lb slow-release 12-6-6 NPK per 100 sq ft at planting.
• Fertilize spring through summer per label; reduce in winter.

Pruning

• Fast-growing, shrubby habit requires trimming late spring through fall.
• Remove spent flower stems, damaged foliage/stems.
• Cut back near ground to stimulate new growth.
• Watch for slug/snail damage; treat as needed.

Cat’s whiskers combines ornamental charm, pollinator appeal, and herbal utility—a standout for tropical and subtropical gardens.