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Cosmos flowering
My Cosmos which I grew from seed are producing masses of healthy green foliage instead of flowering. Why is this ?
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Too much nitrogen feed and not enough potash feed. Try tomato plant food
I have grown Cosmos too and they should have been pink but were all white
They have been flowering for a while, but there was one in the garden that had grown to about 4' tall and not flowered - a bit like yours. Yesterday it flowered.....and it was pink!!!! It might just not be ready to flower yet? I couldn't believe this one flowered as like you I thought it wasn't going to and I hadn't noticed the buds.
Thank you Verdun. Thats just what I have been doing. Overwatering cosmos, in a pot, and wondering when flowers will appear.
I grow these on my allotment , nice flowers and I rarely water them ,
Ahhhhhhhhhhhh ! So, THAT's the answer. I wondered why the cosmos was so bloomin' tall and nae fleurs ! Eeeeeee ya boogah man !
This gardening lark is soooooo confusing.......I spend most of my time worrying that plants haven't been watered enough and will die, when I fact some just don't want water, they should all come with watering instructions
Thanks Verdun 
Will they flower in poor soil?
yes i think they will craig, my trouble is i have improved my soil so much i'm now worried mine won't flower. I started mine from the seed of one i bought last year and i remember it said on the tag to hardly ever water them in the ground, my last years one was planted in clay soil.