Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Asteraceae
Native
Mexico and Arizona
Life Cycle
Annual
Plant Height
Tall (Greater than 24")
Flower Color
Red
Bloom Season
Summer to frost
Further Information
Plant Characteristics
- Attracts Butterflies
- Attracts Hummingbirds
- Attracts Pollinators
- Cut Flower
Growing Conditions
Drought Tolerant
About ["Cosmos"]
Cosmos bipinnatus
Flowers up to 3" start out deep wine-red, turning to rose as they age.
Planting ["Cosmos"]
Plant Spacing
A group of 3 seeds every 12"
Light Required
Full sun
Plant Height
Tall (Greater than 24")
Planting Depth
Barely cover
Planting Details
| Seed Depth | Barely cover |
|---|---|
| Seed Spacing | A group of 3 seeds every 12" |
| Thinning | When 1"–2" tall, thin to 1 every 12" |
| Germination | 5–10 Days |
| Start Indoors | 4 to 6 weeks before your average last frost date. |
| Direct Sow | RECOMMENDED. 1 to 2 weeks after your average last frost date, and when soil temperature is at least 60°F. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
Send Your Recommendation
Total 5 star reviews: 9 Total 4 star reviews: 2 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 2
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Rating
Which best describes you as a gardener?
13 reviews
- LisaVerified BuyerRated 5 out of 5 stars8/28/25Loooove!
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? IntermediateBIBotanical Interests8/29/25Hey 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 🌻️
- S G.Verified BuyerRated 1 out of 5 stars4/21/251 Star
My packet came with 6 seeds. Very displeased.
BIBotanical Interests4/28/25Hey Shyamalika,
Thank you so much for taking the time to share your thoughts in a review. I've reached out to you via email to offer assistance. Your feedback is invaluable to us, and we are committed to ensuring your experience is positive. Thank you once again for your input. Keep on growing 🌻️
- Marcene S.Verified BuyerRated 5 out of 5 stars2/5/255 Stars
I grow cosmos every year. Sometimes save the seeds in the fall. These grew wonderfully and the dried winter stems are still out there making interest in the snow. Love the color of these flowers. I planted these last season. Took no pictures.
- Miriam T.Verified BuyerRated 5 out of 5 stars8/30/245 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 - Arlene R.Rated 1 out of 5 stars8/27/241 Star
Only one seed germinated. I bought a pack for a friend who loves red. None of hers germinated.
Which best describes you as a gardener? Intermediate