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Cosmos sulphureus |
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| | Cool spikey seedhead |
| Common name |
yellow cosmos |
| Family |
asteraceae |
| Life cycle |
annual |
| Flowers |
yellow-orange (summer) |
| Size |
30" |
| Light |
sun |
| Cultural notes |
ordinary garden soil |
From seed  |
germinate at room temperature
detailed seed-starting info below
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| Seed ripens | early August |
We've grown these from seed a few times over the years, but last year I didn't; for the first time, I found a volunteer plant, so that we could enjoy its golden flowers anyway. So we collected seed, and have started them again officially this year.
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In our garden, this plant grows in the following area: back fence border Seed for this plant is included on my seed trade list One or more images of this plant are included in my stock photo catalog About my plant portraits
PlantLinks to other web pages about Cosmos sulphureus
Visitors to this page have left the following comments| Sam Verbena | Jul 16, 2006 | Ihave grown four different cosmo mixes including sonata seashelletc. and this one is my favorite! |
| Harsono | Nov 23, 2008 | Leaves have strong pungent scent and flavour and are used in Javanese cooking, very high in anti-oxidant. |
| Tami M. | Aug 19, 2009 | I planting this beautiful Cosmo from seed and now have a very large, 4 1/2 foot shrub of greenery with no blooms as of yet. It is almost late August and I am wondering if I will see blooms soon? I am in MO and the plant is getting full sun. Thank you for your help.
Our orange cosmos started blooming over a month ago. But I am still waiting for the pink ones to do their thing. Maybe they just like to keep you in suspense... |
| Linda Woods | Nov 08, 2017 | Once you sow cosmos seeds you will ALWAYS have cosmos, every year! Forever. and Ever. However, I got tired of the orange ones EVERYWHERE, so now I am pulling every seedling as I see it to try to change the colors in my garden, lol. Only zinnias are equally prolific in my mind!
That's not my experience – I had to sow afresh every year to have cosmos in the garden. Just goes to show how many differences there are due to climate, gardening methods, etc. |
| Molly | Feb 01, 2023 | There's nothing so nice as an orange cosmos! I've grown the species variety and the compact cultivars and the latter are particularly nice, in my view (sold as "Cosmic Orange" and perhaps other names). They're just such strikingly bright flowers, and the alternation of the petals--half aimed a bit up, half aimed a bit down--really adds some character. They're wonderful in small bouquets and since it's a cut-and-come-again flower, there's a great reason to bring some into the house! |
- Seed for 'Bright Lights', Park '01. Baggy 70F (55%G, 4-6d)
- Seed from '04 garden. Baggy 70F (93%G, 4-7d)
- Seed from '09 garden. Baggy 70F (96%G, 3-6d)
- Seed from '10 garden. Baggy 70F (100%G, 3-5d)
- Seed from '09 garden. Baggy 70F (88%G, 3-5d)
- Seed from '09/'10 gardens. Baggy 70F (94%G, 4-6d)
- Seed from '20 garden. Baggy 70F (50%G, 15-40d)
- Seed from NARGS '23/'24 exchange. Baggy 70F (100%G, 2-8d)
- Same seed as above. Baggy 70F (100%G, 3-6d)
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Last modified:
March 13, 2025
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