1 c. flour
Preheat oven to 400 degrees F. In a medium bowl, combine flour, baking powder, salt and baking soda. Whisk to prevent any lumps. In another medium bowl, blend butter until creamy, about 2 minutes. Slowly blend in lavender petals, sugar, egg, sour cream and vanilla. Gently stir in blueberries and pour into dry ingredients.