In a large bowl, combine cucumber, radish, and salt. Cover and refrigerate for at least 30 minutes. Drain vegetables well, and pat dry.
In small bowl, whisk together sour cream, buttermilk, vinegar, oil, and garlic until smooth. Stir in dill. Add sour cream mixture to cucumber mixture, tossing to combine. Serve immediately.
Recipe by Paula Deen Magazine at https://www.pauladeenmagazine.com/creamy-cucumber-and-radish-salad/