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Cosmos Seeds, Indonesian Kennikura
Description
(Cosmos sulphureus). Beautiful and tasty, this variety is popular in Indonesian cuisine. The bright yellow and orange flowers reach 3 inches across and flower over a long season. This stunning plant also attracts pollinators like bees and butterflies.
- 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
Indonesian Kennikura cosmos is a rare heirloom variety that is easy-to-grow. Once established, it is drought tolerant and needs minimal watering. Remove spent blooms to prolong the blooming season. Avoid excessive fertilization, as it may lead to leafy growth over flower production.
When to Grow
Plant cosmos after all danger of frost has passed. The soil should be at least 60 F warm for the best germination. Since cosmos are not frost-hardy, check your local last frost date before sowing outdoors. This variety blooms approximately 60-90 days after planting and will continue flowering from midsummer until the first frost. Learn more about frost dates by checking out our blog post, ‘Our Experts Answer Questions, Share Resources.’
How to Sow and Plant
Direct sow the seeds in the garden once the risk of frost has passed or start them indoors 3-4 weeks prior to extend the growing season. Sow seeds 1/8-1/4 inch deep, as they need light to germinate. Space the plants about 10 inches apart to give them enough room for growth. Plant seeds in a location that gets 6-8 hours of full sun daily.
How to Grow
Indonesian Kennikura cosmos thrives in well-draining, poor to average soil, as overly fertile soil can reduce flower production. Water moderately, allowing the soil to dry out between waterings. Taller plants may need staking in windy areas to prevent bending. For a longer bloom period, remove spent flowers regularly.
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
Does Indonesian Kennikura cosmos self-seed?
Yes, cosmos readily self-seed, meaning new plants may emerge the following year if seeds are allowed to drop naturally.
Can I grow Indonesian Kennikura cosmos in partial shade?
While cosmos can tolerate light shade, they grow best and produce the most flowers in at least 6-8 hours of full sun every day.
Do I need to water my Indonesian Kennikura cosmos often?
No, this variety is drought tolerant once established and prefers soil that dries out between waterings. Overwatering can lead to weak, leggy growth.
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