Cosmos - Rubenza Seed

Cosmos - Rubenza Seed

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These tall burgundy blooms tower over the rest, changing shades as they age. Cosmos are great seeds for a beginner grower as they flourish well on their own. The more you cut them the more they’ll bloom so snip away!! 2 1/2 to 3 1/2 inch blooms.

Approximate Seeds per Packet: 50

Variety/Hardiness: Annual

Sunlight: Full sun

Mature Height: 36-48”

Germination: 7-10 days at 20-22°C


Transplant: To sow indoors, start 4-6 weeks before the last frost date, covering seeds lightly. Transplant when all threats of frost have passed.

Direct Seeding: Direct seed after all threat of the last frost has passed & soil temperature is above 16°C, covering seeds lightly.

Care: Pinching will encourage branching, but may delay blooming slightly. May benefit from horizontal netting to support plants, especially in windy areas. Deadhead or cut regularly to encourage continuous blooming throughout the season.


Fresh: When harvesting, choose stems that are just starting to open. Strip away any foliage that would fall below the water line so that it does not contribute to bacteria growth in the water. Adding flower preservative to their water will prolong their vase life.

TIP: We often leave some foliage on our cosmo stems to act as built-in foliage in our designs. We love the fluffy, dreamy look that it adds.

Dried: Not typically used as a dried flower.