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- Cosmos grow very quickly but can be killed by a late frost, so don't rush it. They typically germinate in 7 to 21 days at 75 degrees Fahrenheit, followed by flowering in about 50 to 60 days.
www.thespruce.com/how-to-grow-cosmos-4125538
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Cosmos are sun-loving plants with a long flowering season. They fill borders with a profusion of flowers, ranging in colour from white through to pink, red and orange, and they have masses of feathery foliage. Shorter varieties look good in containers and all cosmos make fantastic cut flowers.
- BBC Gardeners' World Magazine
Cosmos. Botanical name: Cosmos. Both the perennial Cosmos atrosanguineus and the annual cosmos are upright plants, making excellent additions to a summer border. The annuals are particularly effective when massed and provide flowers for cutting over a period of months.
Cosmos take between seven and 21 days to germinate. Once Cosmos have finished flowering, their seed heads can be left on to allow for self-seeding for the following year. If you don’t want any Cosmos growing the following year, remove all plants by the root before the seed head appears in the early autumn.
- Cosmos
- Full sun
- Asteraceae
- Half-hardy annual
Jan 8, 2021 · Simple to grow, productive and beautiful, cosmos are supremely easy to love. Find out how to grow and care for cosmos in this guide.
Jul 19, 2024 · Cosmos generally take 7 to 21 days to germinate and will flower within 50 to 60 days of germination. When sown in April or May, expect blooms to start late June to early July and continue through October or the first frost.
- Marie Iannotti
Oct 8, 2021 · How Long Does it Take for Cosmos Seeds to Germinate? Cosmos seeds should germinate within ten to fourteen days, but they can take much longer if the conditions aren’t right.
May 11, 2024 · Step-by-step guide. 1. Choose the right time to sow your seeds. 'Cosmos are summer flowering plants, so need to be planted ahead of the summer season. Cosmo seeds can be sown from early spring.