Jenny wrote:
A certain number of the yellow cosmos I plant come up with huge shaggy
leaves and thick stems but never produce a single flower. This is true
of those I purchase in sets and those I plant from seed.

Last year I left them in assuming they'd eventually bloom, but they
didn't. This year I yanked them.

What's the explanation?
--Jenny

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I've got Cosmos sulphureus "Bright Lights" in several spots with a
couple of ragweed plants growing up among them, which I only just
recently noticed when they outstripped the cosmos in height while
failing to produce any flowers. The foliage is pretty similar--are you
sure it's all cosmos you're looking at?