The oven to 350 degrees. Add 1/4 cup flour to the blackberries and toss; put aside. Cream butter and sugar in a big bowl for 5-7 minutes, or until light and creamy. Stir in the eggs. The remaining 1-3/4 cups of flour should be combined with baking soda, cinnamon, nutmeg, salt, cloves, and allspice; add this combination to the creamed mixture alternately with buttermilk, beating thoroughly after each addition. Add blackberries and fold.

Pour into a 9-inch square baking pan that has been dusted and buttered. Bake for 45 to 50 minutes, or until a toothpick inserted in the center comes out clean. on a wire rack to cool. If using, garnish with confectioners' sugar, more fresh blackberries, and whipped cream.