Xanthos

Family: Asteraceae Annual flowering plant

Planting Schedule

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Feathery, airy blooms rise like warm sparks above the garden—Xanthos Cosmos opens into luminous, petal-rich flowers that sway with every breath of wind.

Expect a delicate, satiny texture and a vivid, show-stopping presence that holds its charm in arrangements, making it a favorite for long-lasting cut stems. Grow Xanthos for a breezy, cloudlike display that turns beds and borders into living color from early summer through fall.

Light: Full SunMaturity: 55 DaysHabit: Upright

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Xanthos Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	May 11th	Jun 1st	Jul 26th – Aug 1st
Zone 2a	May 4th	May 25th	Jul 19th – Aug 29th
Zone 2b	Apr 24th	May 15th	Jul 9th – Aug 25th
Zone 3a	Apr 24th	May 15th	Jul 9th – Sep 1st
Zone 3b	Apr 28th	May 19th	Jul 13th – Sep 21st
Zone 4a	Apr 24th	May 15th	Jul 9th – Sep 24th
Zone 4b	Apr 22nd	May 13th	Jul 7th – Sep 27th
Zone 5a	Apr 17th	May 8th	Jul 2nd – Sep 30th
Zone 5b	Apr 13th	May 4th	Jun 28th – Oct 5th
Zone 6a	Apr 10th	May 1st	Jun 25th – Oct 10th
Zone 6b	Apr 4th	Apr 25th	Jun 19th – Oct 16th
Zone 7a	Mar 30th	Apr 20th	Jun 14th – Oct 20th
Zone 7b	Mar 20th	Apr 10th	Jun 4th – Oct 28th
Zone 8a	Mar 11th	Apr 1st	May 26th – Nov 5th
Zone 8b	Mar 2nd	Mar 23rd	May 17th – Nov 12th
Zone 9a	Feb 13th	Mar 6th	Apr 30th – Nov 26th
Zone 9b	Jan 19th	Feb 9th	Apr 5th – Dec 9th
Zone 10a	—	Oct 1st	Nov 25th – Feb 28th
Zone 10b	—	Oct 1st	Nov 25th – Feb 28th
Zone 11a	—	Oct 1st	Nov 25th – Feb 28th
Zone 11b	—	Oct 1st	Nov 25th – Feb 28th
Zone 12a	—	Oct 1st	Nov 25th – Feb 28th
Zone 12b	—	Oct 1st	Nov 25th – Feb 28th
Zone 13a	—	Oct 1st	Nov 25th – Feb 28th
Zone 13b	—	Oct 1st	Nov 25th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	55
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	55
Min Night Temp (°F)	45
Harden Off (days)	7

Culinary Notes

Chef's Note

Ornamental cut-flower cosmos is not a standard, reliably culinary bloom; despite is_edible being true, there’s no dependable flavor/texture basis to recommend eating Xanthos. Treat it as cut-flower only unless you have a specific, verified edible-use guide for this exact variety.

Flavor Profile

Ornamental flower profile; no reliable culinary flavor data for eating the blooms Potentially astringent/leafy if used unwisely Expect delicate mouthfeel rather than bold sweetness

Frequently Asked Questions

What pest or disease commonly affects Cosmos bipinnatus, and how can I control it?

Cosmos bipinnatus is often troubled by aphids, especially on tender new growth and flower buds. Rinse plants with a strong water jet, then spray insecticidal soap (follow label directions) and repeat every 5–7 days until aphid numbers drop. If you see powdery-white growth on leaves, remove badly affected foliage and increase airflow (thin plants and avoid overhead watering) to slow the spread.

How often should I water Cosmos bipinnatus during peak growth?

During the main growing phase, keep the soil evenly moist but not soggy—water when the top 1 inch of soil feels dry. Cosmos will tolerate some dryness once established, but consistent moisture helps it branch and produce steady flowers, especially in warm weather. Water at the base to avoid wetting foliage, which can encourage leaf diseases.

How can I tell when Cosmos bipinnatus is ready to harvest?

Harvest flowers when the bloom is fully open and the petals are crisp and brightly colored, usually about 55 days from sowing under good conditions. For seed harvest, leave seed heads on the plant until they turn brown and feel dry, then collect them before they shatter. Cut flowers regularly to keep plants producing fresh blooms throughout the season.