They have aster yellows, a virus. Sorry to say but they need to be pulled and disposed of.......

Probably Aster Yellows. Sometimes, when the leaves look fine, mites can be the problem (or so I heard)

Edited. Why does it say “be the first to comment” even though I did? Weird.

I've never seen that - how strange!

Sherry

Its got Aster yellows disease. They should be removed and destroyed or discarded in the trash. Or it might be eriophyid mites, in which case cut off and dispose of the infected flower heads.

Oh dear, that's a clear and classic sign of a disease called Aster Yellows, caused by a phytoplasma and spread by tiny leafhoppers. It is terminal and your only recourse is to remove all of your echinacea and dispose in the trash.

You might do some research on Aster Yellows, it can affect so many different kinds of plants.

vivipary? false vivipary? Is it just this plant or is it all your plants?