Garden Pests and Diseases: Moonbeam Coreopsis Disease?, 1 by SILLYLILY

SILLYLILY wrote:
I know that "Moonbeam" coreopsis was the perennial plant of the year and is relatively disease resistant. In its first year, our Moonbeam was magnificent! In its second, and this, its third year, the plants have not performed well at all. They are not crowded out, nor are they over or under watered. We fertilized with miracle-gro every week. The care was the same both in its glorious first year as well as its disappointing second and third. The plants seem to be "hollow" or getting bare in the center. What's left on the outside circumference of this bare spot is small and does not bloom well. Any ideas? Too much fertilizer? Not enough? Bugs/parasites? (all other plants in the gardens are doing just fine)

Please help....we really love this flower!

The photo does not show how short and "[deleted]" this plant really is. It should be twice as tall and round and filled with a myriad of beautiful little yellow blossoms.

Thanks.