Coreopsis - Deer-Resistant Perennial

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Oh, the variety I picked was Coreopsis tinctoria because I love dual color flowers and it did well last year for me and kept blooming like cosmos. I'm just worried if it will have any chance at all to compete and even get established against that already established evil roadside grass with just hand scattering without zero soil preparation at all. Its so incredibly dry in Georgia I think flowers that thrive in dry places, actually in Georgia will require as damp a place as you can find for it

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The pound of Cosmos I planted last year preferred and even thrived in the bottom of a different roadside ditch I planted, but it was freshly made and disturbed dirt after roadside work, with no to little grass competition. I'm planting the same ditch with a southeastern mix and the firecracker mix from wildseedfarms/

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How well will this grow in roadside ditches where roadside grass is already dominant and established? I bought a pound of this to seed the center ditch of GA 88 between Milledgeville and Wrens on a long deserted strand of four lane highway, as I have traveled hundreds of times this road to pick up my girlfriend in Macon. I traveled 10,000 miles on this road just to be with her. Long after we are dead I want our flowers to still bloom after our love is gone.