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We're getting ready for the new year!

We have been busy packing our favorite flower seeds and gearing up for another amazing year. Stay tuned for back in stock seeds and plants for 2025 plus over 75 new varieties!
Cosmos 'Xanthos'
Cosmos 'Xanthos'
Cosmos 'Xanthos'
Seed Packet

Cosmos 'Xanthos'

Cosmos bipinnatus
Cosmos 'Xanthos' is a great improvement over the heirloom yellow cosmos that often begins to flower just a few weeks shy of frost here in zone 5b. This new freely blooming variety is compact and blooms early too. It has charming soft yellow flowers with single or collarette rounded petals. This award winner is a feather in the cap of breeder Rob van der Voort!
SKU #S1251
$4.50
Currently Unavailable
Notify Me When Available
Growing Companions
Cosmos 'Apricot Lemonade'
Cosmos 'Apricot Lemonade'
Zinnia 'Jazzy Red'
Zinnia 'Jazzy Red'
Zinnia 'Queeny Lemon Peach'
Zinnia 'Queeny Lemon Peach'
Snapdragon 'University of California Mix'
Snapdragon 'University of California Mix'
Details
Approximate Seeds Per Packet
37
Lifecycle
Annual
Annual Hardiness
Half Hardy Annual
Mature Size
1.5-2' h x 1.5' w
Sun
Full sun
Soil
Regular, well-drained
Season
Summer to fall
Color
Creamy yellow
Features
Great Cut Flower
Heat or Drought Tolerant
Attracts Butterflies
Attracts Bees
Attracts Beneficial Insects
Notable
Fleuroselect Gold Medal Winner
SOWING INSTRUCTIONS
Depth:
1/8-1/4"
Sprout Time:
3-10 days
Seed To Bloom:
8-12 weeks
Starting Indoors:
Start in pots 4-5 weeks before last spring frost. Keep at about 60-75°F.
Starting Outdoors:
Direct sow in spring, after last frost.
WHEN TO SET OUTSIDE
In springtime, after all danger of frost has passed.
PLACEMENT & CULTIVATION
Cosmos 'Xanthos' is a new compact selection with a bevy of blooms in primrose yellow, some single, some with extra petals. Grow in a large container or mix with pastel pink and blue flowers in the border. Pinch once when 1' tall to encourage more branching and deadhead, or cut often for bouquets for non-stop blooms. It attracts numerous beneficial insects, making it an excellent addition to the borders of vegetable gardens too!
Final Spacing:
1-1.5'
Water Requirements:
Low Water Use
Watering Details:
Drought tolerant. Water regularly while establishing, then only during dry, hot spells.
Soil pH:
Prefers acidic to neutral
Fertilizer:
Cosmos thrive in regular soil and may sprawl in nitrogen rich soils. If desired, an application of organic flower fertilizer can be mixed in around plants.
Diseases & Pests:
No major pests or diseases. Powdery mildew can be discouraged with a regular preventative application of a baking soda based spray.
When to Cut for Bouquets:
Harvest when flowers start to open to 1/2 open; best vase life before the flowers are pollinated.