Ask a Question forum: is my Cosmos supposed to bloom by now?

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Name: Gary
Cincinnati Ohio (Zone 6a)
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Gschnettler
Aug 6, 2016 12:15 PM CST
it seems like it's doing really well, but no sign of any flowers yet. Should I be concerned or just patient? I live in Cincinnati - Zone 6. I put the football in the picture so you could see how big the Cosmos has gotten.




Thumb of 2016-08-06/Gschnettler/45e145

Name: Elaine
South Sarasota, Florida (Zone 9b)
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dyzzypyxxy
Aug 6, 2016 3:26 PM CST
They sure look like they're ready to me. Are they maybe getting too much shade, Gary? I see in the picture most of the street is in the sun but the cosmos plants are shaded. They really need some sun to bloom.

If that's not the cause, well you can try scaling back on water just a bit to stress them into blooming. Don't let them completely wilt, but let them dry out a bit.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." โ€“Winston Churchill
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Aug 6, 2016 3:46 PM CST
I've had the same problem some years. Same treatment, same flower bed. I once went looking for answers and found this theory from several years back in the UK:

http://www.telegraph.co.uk/gardening/howtogrow/3315412/A-dis...
Name: Tiffany
Opp, AL (Zone 8b)
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purpleinopp
Aug 7, 2016 6:10 AM CST
I have 1 big plant from scattering seeds in the spring, just now starting to bloom a vibrant fuchsia color. They weren't any particular kind, just "cosmos."

๐Ÿ‘€๐Ÿ˜๐Ÿ˜‚ - SMILE! -โ˜บ๐Ÿ˜Žโ˜ปโ˜ฎ๐Ÿ‘ŒโœŒโˆžโ˜ฏ๐Ÿฃ๐Ÿฆ๐Ÿ”๐Ÿ๐Ÿฏ๐Ÿพ
๐Ÿ€๐Ÿ‘’โ˜€๐Ÿ„๐Ÿ๐ŸŒฑ๐ŸŒฟ๐ŸŒด๐ŸŽ„๐Ÿ‘ฃ๐ŸŒต๐ŸŒทโš˜๐ŸŒน๐ŸŒป๐ŸŒฝ๐Ÿก๐Ÿƒ๐Ÿ‚๐ŸŒพ๐ŸŒฟ๐Ÿโฆโง ๐Ÿƒ๐Ÿ๐Ÿ‚๐ŸŒพ๐ŸŒป๐ŸŒบ๐ŸŒธ๐ŸŒผ๐ŸŒน๐ŸŒณ๐ŸŒฒ
โ˜•๐Ÿ‘“ The only way to succeed is to try.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 7, 2016 6:21 AM CST
See Figures 2 and 3 in this article. My understanding from the other article I posted is that the cosmos seed source influences whether they are short-day or not. I don't know what the critical daylength for them is but the days are starting to get shorter now.

https://www.extension.purdue.edu/extmedia/ho/ho-249-w.pdf

In Gary's case I also wonder if there might be some influence from street or house lighting at night.

Name: Tiffany
Opp, AL (Zone 8b)
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purpleinopp
Aug 7, 2016 6:45 AM CST
Fascinating! My plant is in the front yard, and there are street lights.
๐Ÿ‘€๐Ÿ˜๐Ÿ˜‚ - SMILE! -โ˜บ๐Ÿ˜Žโ˜ปโ˜ฎ๐Ÿ‘ŒโœŒโˆžโ˜ฏ๐Ÿฃ๐Ÿฆ๐Ÿ”๐Ÿ๐Ÿฏ๐Ÿพ
๐Ÿ€๐Ÿ‘’โ˜€๐Ÿ„๐Ÿ๐ŸŒฑ๐ŸŒฟ๐ŸŒด๐ŸŽ„๐Ÿ‘ฃ๐ŸŒต๐ŸŒทโš˜๐ŸŒน๐ŸŒป๐ŸŒฝ๐Ÿก๐Ÿƒ๐Ÿ‚๐ŸŒพ๐ŸŒฟ๐Ÿโฆโง ๐Ÿƒ๐Ÿ๐Ÿ‚๐ŸŒพ๐ŸŒป๐ŸŒบ๐ŸŒธ๐ŸŒผ๐ŸŒน๐ŸŒณ๐ŸŒฒ
โ˜•๐Ÿ‘“ The only way to succeed is to try.

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