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
Yellow
Bloom Season
Summer to frost
Further Information
Plant Characteristics
- Attracts Hummingbirds
- Attracts Pollinators
- Cut Flower
Growing Conditions
Drought Tolerant
About Xanthos Cosmos Seeds
Cosmos bipinnatus
2"–2½" soft-yellow blooms with white at the center and petal edges; single petaled and some with a wreath of shorter petals in the center.
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
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Rating
Which best describes you as a gardener?
18 reviews
- MaryRated 5 out of 5 stars10/5/265 Stars
Germinate very fast in so-cal zone 10a had three beautiful plants survive, but the many heat waves of August/September took them so I bought more seeds. Nice and compact unlike the other varieties which are much taller, definitely plant the Xanthos in front. Love this company for their seeds, all I have bought have germinated.
- KTMI, United StatesVerified BuyerRated 5 out of 5 stars10/3/26Beautiful color! Easy direct sow
Stunning variety! I'm not someone who flocks to yellow, so can't explain why I chose to try this out, but it was so beautiful testing it in my Zone 6 garden! They seem to prefer being direct sown (and didn't mind growing with my dahlias and dill). I'll definitely be doing this again next year.
Which best describes you as a gardener? IntermediateWho do you grow for? YourselfHow do you prefer to grow? Raised BedBIBotanical Interests10/6/26Hey KT,
We're so happy to hear that your Xanthos Cosmos Seeds turned out to be such a beautiful addition to your Zone 6 garden! It's awesome that they thrived with direct sowing and played so nicely with your dahlias and dill. Thanks so much for being part of the growing community and for sharing your experience! Keep on growing 🌻
- Jordan S.Verified ReviewerRated 5 out of 5 stars9/26/26Updated Review
I previously left a poor review because I couldn’t get these seeds to germinate, but I’m happy to say I gave them another try this year and had great results! I planted seven plants in the pot shown in my photos and they are absolutely beautiful. Everyone who sees them compliments the flowers! They attract lots of butterflies and bumble bees and they’ve been very easy to care for. I’m so glad I tried them again and would definitely recommend them.
Which best describes you as a gardener? ProfessionalBIBotanical Interests9/27/26Hey Jordan,
We're so happy to hear that your Xanthos Cosmos Seeds have been such a fantastic success this time around! It's awesome that you gave them another try and ended up with such beautiful results. Seven gorgeous plants that are attracting butterflies and bumble bees sounds amazing! Thanks so much for being part of the growing community! Keep on growing 🌻
- Erika F.Verified BuyerRated 1 out of 5 stars8/5/26Only 2 out of 25 seeds germinated
I was very disappointed with the germination rate from this packet. I planted all 25 seeds, and only 2 germinated. The two that sprouted are still just seedlings, so I can’t review the flowers yet, but a germination rate of only 8% is extremely poor.
Which best describes you as a gardener? BeginnerBIBotanical Interests8/11/26Hey Erika,
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 🌻️
- taylorRated 1 out of 5 stars8/2/26no success for me
i have ordered and also purchased in store many botanical interest seeds with much success, however like many others state these were just hard to grow… first round in spring i didnt see much germination but maybe the nights were a little too cold for their liking (7b grower) so a little further on i planted more and got a few more sprouts but in the long run eventually all of them ended up not making it. they seem super finicky in comparison to other cosmos (for reference i have 3 other kinds thriving that i planted at the same time) bummed, because these look gorgeous!
Which best describes you as a gardener? IntermediateBIBotanical Interests8/4/26Hey taylor,
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 🌻️