Youngia japonica
Youngia japonica · Asteraceae
The gardener's calendar
Ideal time to plant youngia japonica: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Blooming
- Summer to autumn (July-October)
- Adult size
- 0.30 to 0.60 m in height
- Growth
- Fast
- Hardiness
- Moderate (−5 to −10 °C)
- Origin
- East Asia (Japan, China, Korea)
- Soil type
- Well-drained, fertile
Care
Light exposure
Youngia japonica prefers full sun to partial shade for optimal growth. It tolerates partly shaded areas but flowers more abundantly in sunlight. Avoid overly dark exposures that would slow down flowering.
Watering
Keep the soil regularly moist, especially during active growth and flowering. Reduce watering in winter. Avoid waterlogging which promotes root rot. A light mulch helps retain moisture.
Soil
Plant in well-drained, fertile potting soil enriched with organic matter. Youngia japonica adapts to neutral to slightly alkaline pH. Compacted soil hinders rooting: aerate before planting.
Fertilizing
Apply balanced fertilizer every 3 to 4 weeks during the growing period (spring-summer). Stop in autumn and winter. An initial application of well-decomposed compost is often sufficient.
Pruning and cutting
Pinch young stems regularly to encourage branching and a compact shape. Remove spent flowers to extend blooming. In late winter, cut back stems to rejuvenate the plant if it becomes too woody.
Diseases and pests
Watch for powdery mildew in humid conditions: ensure good air circulation. Slugs and snails enjoy young foliage: protect if needed. Excess moisture causes rot; improve drainage and air circulation.
Did you know?
Youngia japonica, also called 'Japanese hawksbeard', is a very common ruderal plant in East Asia where it spontaneously colonizes roads and disturbed spaces. Its scientific name honors Thomas Young, a 19th-century English scholar, although the plant is primarily known for its remarkable ability to adapt to difficult environments rather than for major medicinal uses.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.