Botanical Interests
Rubenza Cosmos Seeds
Rubenza Cosmos Seeds
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Product Details
Product Details
Deeply colored 3" blooms are beauteous in contrast when paired with white flowers and silver-foliage plants. A Fleuroselect Novelty award winner, this cosmos is a real standout in the garden or a vase, and butterflies love them, too. Blooms start out red-wine colored and turn to dusky rose as they age. Growing cosmos is an easy way to add color to your garden, as they require little attention and are drought tolerant.
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- Variety Info
- Sowing Info
Variety Info
Family: Asteraceae
Type: Cosmos (Learn more)
Native: Mexico and Arizona
Hardiness: Annual
Exposure: Full sun
Bloom Period: Summer to frost
Plant Dimensions: 24"–32" tall, about 28" wide
Variety Info: Flowers up to 3" start out deep wine-red, turning to rose as they age.
Attributes: Attracts Butterflies, Attracts Hummingbirds, Attracts Pollinators, Cut Flower, Drought Tolerant
Sowing Info
When to Sow Outside: RECOMMENDED. 1 to 2 weeks after your average last frost date, and when soil temperature is at least 60°F.
When to Start Inside: 4 to 6 weeks before your average last frost date.
Days to Emerge: 5–10 Days
Seed Depth: Barely cover
Seed Spacing: A group of 3 seeds every 12"
Thinning: When 1"–2" tall, thin to 1 every 12"
- Miriam T.Verified BuyerRated 5 out of 5 starsAug 30, 20245 Stars
I love the color these Rubenza cosmos add to my small rooftop garden. Even though they are in full sun, they can withstand not being watered every few days.
Which best describes you as a gardener? Intermediate - Loris M.Verified BuyerRated 5 out of 5 starsFeb 18, 20245 Stars
Great product resource.
- Lily ..Rated 5 out of 5 starsJan 28, 20245 Stars
I really love the color of these. As described, they do in fact start out very vibrant, before fading beautifully into a duskier pink. Among my favorite flowers in the garden!
Which best describes you as a gardener? Intermediate - Peggy G.Rated 5 out of 5 starsDec 28, 20235 Stars
I did landscaping yrs ago, retired(both careers), couldn't "move earth"last yr (2023) so I literally threw seeds... Cosmos and Zinnias well it was like a Monet painting!
Which best describes you as a gardener? Professional - LisaVerified BuyerRated 5 out of 5 starsAug 28, 2025Loooove!
I love the color of these cosmos. They range from a beautiful wine color to a softer faded rose color depending on the age of the flower. One of my favorite flowers this year!
Which best describes you as a gardener? IntermediateEGEpic GardeningAug 29, 2025Hey Lisa,
Thank you so much for sharing your fantastic experience with our Rubenza Cosmos Seeds! We absolutely love hearing that they've become one of your favorite flowers this year! That beautiful color range you're describing is exactly what makes the Rubenza variety so special and captivating. There's something so magical about how cosmos flowers evolve and show different shades as they mature! Keep on growing 🌻️
