Sulphur cosmos (Cosmos sulphureus)
Care, watering, light and tips for Sulphur cosmos on Floravia.
Quick facts
- Family: Asteraceae
- Difficulty: Easy to care for
- Watering: every 5 days
- Light: Full sun
- Temperature: 0–35 °C
About Sulphur cosmos
Cosmos sulphureus, also known as Sulphur Cosmos, is a showy annual plant from the Asteraceae family, native to Mexico. Its vibrant flowers, ranging in shades of yellow, orange, and red, attract pollinators and are ideal for adding a lively touch to flowerbeds, borders, and cottage gardens. Reaching heights of over a meter, it creates an impressive visual impact in any sunny landscape.
Native range
Mexico and the southern United States
Care tips
This species thrives in full sun, requiring at least 6 hours daily for abundant flowering. It prefers well-drained, poor to moderately fertile soils, and is quite drought-tolerant once established, so watering should be moderate. Avoid over-fertilization, as this can promote leafy growth at the expense of flowers. A common mistake is planting it in partial shade, which drastically reduces blooming.
How to save a dying Sulphur cosmos
- Warning signs
- Yellow or wilting leaves, soft or leaning stems, no flowering.
- First aid
- Check watering, ensure good drainage and full sun. Prune spent flowers.
- What kills it
- Overwatering leading to root rot or lack of sun. Doesn't tolerate shade or heavy soils.
- Can it be saved?
- Yes, if you act quickly. They are resilient if environment and watering are corrected.