Cosmos Plant Temperature
Plant seeds in prepared soil about 2 inches 5 cm apart and one half inch 1 cm deep.
Cosmos plant temperature. Cosmos are half hardy annuals that grow flower set seed and die all in one year but unlike hardy annuals they can t withstand low temperatures. Because sprouts will develop quickly be sure to scatter seeds after all danger of frost has passed in the spring. Cosmos can tolerate dry soil even in a hot arid sunbaked spot. Cosmos typically germinate in 7 21 days at 75 degrees fahrenheit followed by flowering in about 50 60 days.
Minimum temperature ranges in degrees c are shown in brackets. Cosmos is one of the easiest flowers to grow from seed that is directly sown in the garden bed. Over watering and over fertilization can lead to plants with fewer flowers. H1a under glass all year 15c h1b can be grown outside in the summer 10 15 h1c can be grown outside in the summer 5 10 h2 tolerant of low temperatures but not surviving being frozen 1 to.
Germination takes between 7 and 10 days at the optimal temperature of 75 degrees fahrenheit 24 c. Seed packets usually recommend precise spacing such as at two foot intervals but you will get a better display if you simply scatter the seeds and let the plants support each other as they grow. Thinning is really not necessary. Find help information on cosmos bipinnatus cosmea from the rhs search.
Alternately if you have a very short growing season you may sow seeds indoors 4 5 weeks before your frost free date in plug trays to get a jump start on. Apart from needing at least a half day of sunshine cosmos seem to thrive on neglect. If the early spring has been cold soil temperatures will also remain cool. Cosmos beds may become weedy due to the fact that they self seed so remember to check them.
Flowering begins between 60 and 90 days after germination it prefers a soil ph between 6 0 and 8 5 reflecting its native habitat in the alkaline regions of central america. Do not plant cosmos too deep firm or rake cosmos seeds into a loose soil if the cosmos seeds are planted too deep germination can be affected. If the soil temperature is below 18c seeds may not germinate as rapidly. Cosmos seeds will sprout in 7 21 days.
Keep the soil moist for 5 10 days after sowing. Allow 12 inches 30 cm between very tall varieties. They re quick and easy to grow from seed flowering in as little as 12 weeks and can be added to borders and pots for a burst of showy colour. Thin to 8 inches 20 cm apart in all directions for dwarf varieties.
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