Galinsoga
Galinsoga parviflora · 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
- Family
- Asteraceae
- Type
- Annual or biennial herbaceous plant
- Adult height
- 20 to 60 cm tall
- Flowering
- July to October
- Foliage
- Deciduous, light green
- Growth
- Very fast
- Origin
- Tropical and subtropical America
- Hardiness
- Annual or biennial depending on climate
Care
Watering
Smooth galinsoga prefers regularly moist soil without being waterlogged. Water moderately during the growing period, especially in summer. Reduce watering in autumn-winter. In pots, check substrate moisture before each watering.
Light exposure
Place this herbaceous plant in a sunny to partially shaded location. It tolerates bright spots well and develops quickly under good light. In very hot climates, light afternoon shade can be beneficial.
Soil and substrate
Galinsoga prefers rich, well-drained soil that is slightly acidic to neutral. Universal potting soil enriched with organic matter works well in pots. Avoid compacted or poor soils that would slow down growth.
Fertilization
Apply balanced or nitrogen-rich fertilizer every 2 to 3 weeks during active growth. In pots, regular feeding maintains vigor. Reduce application in autumn.
Pruning and maintenance
Pinch young stems to promote branching and a more compact form. Regularly remove faded flowers to encourage prolonged flowering. With vigorous growth, regular cleaning helps control development.
Diseases and pests
Galinsoga is generally robust. Watch for powdery mildew in overly humid and stagnant conditions. Spider mites can affect dry indoor plants. Good air circulation and regular hygiene prevent these issues.
Did you know?
Smooth galinsoga, originally from Central America, has become one of the most invasive weeds worldwide. It spread rapidly throughout Europe and Asia from the 19th century onward, often hidden in flower seeds. Despite its invasive status in the wild, it remains cultivated as an ornamental plant for its delicate small white and yellow flowers.
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.