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PlantSnap
Plant Care
Ulam raja
(Cosmos caudatus)
Also Known As
Ulam raja, Cosmos, Blossom cosmos, Mexican cosmos, Wild cosmos, Cosmos sulphureus
About This Plant
Cosmos caudatus is an annual flowering plant species in the Asteraceae family. It is native to Southeast Asia, but has been introduced to other parts of the world. The plant can grow up to 6 feet (1.8 meters) tall and has feathery leaves with small, pink or white flowers.
Plant Care Instructions
Outdoor Size Range
3-6 feet (0.9-1.8 meters) tall and 1-2 feet (0.3-0.6 meters) wide
Light Requirements
Cosmos caudatus requires full sun to grow and bloom properly. It needs at least 6-8 hours of direct sunlight per day.
Humidity Needs
Cosmos caudatus prefers dry air, but can tolerate moderate humidity levels.
Fertilizing Schedule
The plant does not require fertilizer, but can benefit from a balanced fertilizer once a month during the growing season.
Pruning Guidelines
Deadheading spent flowers can promote more blooms. The plant can be pruned back in the fall to prevent self-seeding.
Common Pests and Diseases
Common pests include aphids, spider mites, and whiteflies. Diseases include powdery mildew and leaf spot.
Indoor Size Range
Not suitable for indoor growing
Watering Schedule
The plant requires moderate watering. It should be watered when the top 1-2 inches (2.5-5 cm) of soil is dry. Overwatering can lead to root rot.
Temperature Range
The plant can tolerate a wide range of temperatures, from 50-85°F (10-29°C). It is important to protect the plant from frost and freezing temperatures.
Growing Season
The plant blooms from mid-summer to fall.
Growing Difficulty Level
Cosmos caudatus is easy to grow and care for, making it a great choice for beginner gardeners.
USDA Hardiness Zones
Cosmos caudatus is hardy in USDA zones 9-11.
Did You Know?
In Malaysia, Cosmos caudatus is used as a traditional medicine to treat fever and other ailments.
