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Preheat oven to 400 degrees. Grease a 9x5-inch loaf pan or 9x2-inch round cake pan.
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In a large bowl, whisk together the two types of flour, wheat germ, salt, sugar, and baking soda. Cut in the butter with a pastry blender or your fingers until it resembles coarse crumbs.
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Add the buttermilk to the bowl and stir to combine. Using a firm spatula or a wooden spoon, fold the dough over onto itself in the bowl many times. It should take just a minute or two for it to start coming away cleanly from the side of the bowl.
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Press the dough into your prepared pan. Bake 30-40 minutes for the round, 1 hour for a loaf.
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Remove from the oven and cool in the pan for 10 minutes, then take the loaf out and transfer to a cooling rack. The bread will cut easier if you let it cool until warm, but it can also be eaten right away.