Name: josephine Arlington, Texas (Zone 8a) Hi Everybody!! Let us talk native.
It looks like the Aster Yellows, a disease that attacks plants of the Asteracea family especially Coneflowers.
I have had it here too.
Here is a link; http://www.missouribotanicalga...
Wildflowers are the Smiles of Nature.
Gardening with Texas Native Plants and Wildflowers.
