February 7, 2023
Cosmos sulphureus

Cosmos sulphureus

Cosmos sulphureus is also known as Bidens sulphurea or Yellow Cosmos. It is part of the Asteraceae family of plants. It is a half-hardy annual. It is native to Mexico, Central America, and South America.

Most cultivar’s height range between 30cm to 90cm or 1 to 3ft. The foliage is opposite and pinnately divided. The flowers range from yellow to oranges and red. It flowers through summer and autumn.

Cosmos sulphureus
Cosmos sulphureus at Cleary Garden in London

How to grow Cosmos sulphureus:

Grow Cosmos sulphureus in the sun. Plant it in moist but well-drained soil. It prefers more alkaline soil. This is a drought-tolerant plant. Deadheading flowers can prolong the flowering season.

Cosmos sulphureus
Cosmos sulphureus at Cleary Garden, London

Cosmos sulphureus attracts birds and butterflies. It is self-seeding. It is considered invasive in the United States. Propagate Cosmos sulphureus from seeds. Usually, it germinates between 1 to 3 weeks depending on the climate. It flowers about two months after germination. It is generally disease-free and pest-free. Watch out for gray mold, slugs, and aphids.

They use Cosmos sulphureus in food in Indonesia it is called Lalab or Gudang. These are the young shoots of Cosmos sulphureus. They are consumed raw as well as cooked. In Thailand. they make tea from flowers. The flowers can be used as a dye for fabric or wool.

Cosmos sulphureus
Cosmos sulphureus at Cleary Garden London

Cosmos sulphureus photos on this page are photographed at the Cleary Garden in London. Cleary Garden is a small stepped terrace garden that was created after the bombing of World War II.

Cosmos sulphureus
Cosmos sulphureus at Cleary Garden, London

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