Asperula tinctoria
Asperula tinctoria · Rubiaceae
The gardener's calendar
Ideal time to plant asperula tinctoria: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- May to July, pink or white flowers
- Adult size
- 30 to 50 cm in height
- Growth
- Moderate
- Hardiness
- Hardy, down to -15°C
- Origin
- Central and southern Europe
- Soil type
- Well-drained, light, chalky
Care
Light exposure
Asperula tinctoria prefers full sun to partial shade. It tolerates sheltered locations well. Place it in a spot where it receives at least 4 to 6 hours of direct light daily for optimal flowering.
Soil
This plant appreciates light, well-drained soil that is rather chalky. Enrich the soil with compost or potting soil at planting time. Avoid heavy soils and waterlogging, which can cause root rot.
Watering
Water regularly during growth and flowering, keeping the soil slightly moist without waterlogging. Reduce watering after flowering. In winter, minimal watering is sufficient; the plant tolerates some dryness.
Fertilizing
Apply balanced fertilizer in early spring to support growth. Moderate application of organic or mineral fertilizer during flower formation promotes better blooming without excess.
Pruning and maintenance
Pinch back the tips in spring to encourage branching and a bushy habit. Remove spent flowers regularly to extend the flowering period. Light pruning in late autumn can be done to tidy up the plant.
Diseases and pests
Asperula tinctoria is generally not very susceptible to diseases if drainage conditions are correct. Watch for powdery mildew in case of excessive humidity. Spider mites may appear in dry conditions; increase ambient humidity slightly.
Did you know?
Asperula tinctoria was once used by European dyers to obtain red or purple tints. Its roots contain natural coloring compounds that served for centuries before the arrival of synthetic dyes in the 19th century. The Asperula genus remains a heritage of traditional natural dyeing.
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.