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Cosmos Seeds, Japanese Kiiro
Description
(Cosmos bipinnatus). Beautiful soft yellow blooms. The 4-foot tall plants make soft clouds of soothing color, perfect for the back of the border and lovely in arrangements. A totally unique and different color of cosmos that is beloved by gardeners and pollinators alike!Â
- Annual
- 60-90 days to maturity
- 6-8 hours of full sun
- Sprouts in 7-14 days
- Seed Depth: 1/8-1/4"
- Plant Spacing: 10"
- Ideal Temperature: 70-75 F
- Frost Hardy: No
Growing Tips, Tricks and FAQs
Growing Tips
Japanese Kiiro cosmos is an heirloom variety that thrives in warm weather. It prefers full sun and well-draining, poor to moderate soil. Once established, it is drought tolerant and requires minimal care. Deadhead spent blooms to encourage continuous flowering throughout the growing season. Avoid over-fertilizing, as it can lead to excessive foliage with fewer blooms.
When to Grow
Plant cosmos only after the last frost when temperatures remain consistently warm. Seeds germinate best at temperatures between 70-75 F. Since cosmos are not frost-hardy, it is very important to check local last frost dates before sowing outdoors. The growing season lasts from spring to early fall, with blooms appearing from midsummer until the first frost. If you’re uncertain about your frost-free dates, check out our blog post, ‘Our Experts Answer Questions, Share Resources.’
How to Sow and Plant
Seeds can be sown directly into the garden after the last frost or started indoors 3-4 weeks before transplanting. Lightly cover seeds with 1/8-1/4 inch of soil, as they need some light for germination. Space plants about 10 inches apart for good airflow and healthy growth. Keep the soil moist but not waterlogged during germination.
How to Grow
Cosmos prefer well-draining, light soil and do well even in poor soil conditions. Water moderately, allowing the soil to dry out between waterings to prevent weak, leggy stems. Too much nitrogen will result in excessive foliage instead of flowers, so be careful not to over-fertilize. Plants in windy areas might need staking.
How to Save
- Cosmos are insect pollinated, and there may be some crossing between varieties in the garden. You can enjoy the mixing or use caging techniques and hand pollination to avoid crossing.
- Saving seeds from cosmos is easy: simply allow the heads to brown and dry on plants and collect seeds. Store in a cool, dry, dark place over winter.
FAQ
Can Japanese Kiiro cosmos tolerate drought?
Yes, once established, cosmos are drought tolerant and prefer drier conditions over excessive moisture.
Can the Japanese Kiiro cosmos grow in pots?
Yes, cosmos can be grown in containers. Use a well-draining pot and place it in full sun for best results.
Why are my Japanese Kiiro cosmos growing tall but not flowering?
Over-fertilization, particularly with nitrogen, can cause leafy growth at the expense of blooms. Reduce fertilizer use and make sure that the plants receive enough sunlight.
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