Galinsoga
Galinsoga quadriradiata · Asteraceae
The gardener's calendar
Ideal time to plant galinsoga: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, light green
- Blooming
- Summer to fall (July to October)
- Adult size
- 12 to 24 inches tall
- Growth
- Very fast
- Hardiness
- Not hardy, annual or summer plant
- Origin
- Tropical and subtropical America
- Soil type
- Light, well-draining soils, undemanding
Care
Watering
Keep the soil regularly moist without excess during growth. Reduce watering in autumn. Avoid standing water which promotes root rot. Moderate watering is sufficient, as this plant tolerates short dry periods well.
Light Exposure
Place your galinsoga in full sun to partial shade for generous blooming. It adapts well to partially shaded spots. A minimum of 4 to 5 hours of direct daily light is recommended.
Pruning and Cutting
Regularly pinch young plants to encourage a bushy, branching habit. Remove spent flowers to extend blooming. Light pruning at the top above buds will encourage better branching.
Soil and Growing Medium
Prefer light, fertile, well-draining soil. A mixture of universal potting soil enriched with compost works perfectly. This plant is undemanding and tolerates poor soils, but fears waterlogging.
Fertilizer
Apply balanced fertilizer every 15 to 20 days during the growth and blooming period. Choose a formula slightly enriched in phosphorus and potassium to support flower production. Reduce applications at season's end.
Diseases and Pests
Watch for aphids and spider mites, particularly indoors. Powdery mildew may appear in humid conditions; ensure good ventilation. Root rot occurs with excessive watering; maintain adequate drainage.
Did you know?
Galinsoga, a hairy invasive cosmopolitan plant, spread rapidly from European botanical gardens in the 19th century. Today, it's found on every continent and considered a formidable weed for farmers, capable of producing several seed generations in a single season. Despite this 'weed' reputation, it remains a charming ornamental plant with white flowers edged in yellow.
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.