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cosmos not blooming

Questa, NM(Zone 5b)

I planted plenty of cosmos this year and they're growing full and tall, but I only have a few blooms on a few plants. Can anyone help me figure out what I did wrong? They're in my flower beds where I have other flowers blooming. I didn't add a high nitrogen fertilizer, in fact, for most, I didn't add a fertilizer at all. For some, I laid compost around them.

Thanks!

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