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Preheat oven to 425°F (220°C) and line a baking sheet with parchment paper.
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In a large bowl, combine flour, lavender, baking powder, salt, and sugar.
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Cut in cold butter using a pastry cutter or fork until mixture resembles coarse crumbs.
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Gradually stir in buttermilk until dough just comes together. Do not overmix.
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Turn dough onto a lightly floured surface and gently pat to about 1-inch thickness.
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Cut biscuits using a floured cutter, pressing straight down without twisting.
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Place biscuits on prepared baking sheet. Brush tops with egg wash or milk and sprinkle with coarse sugar if desired.
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Bake for 12–15 minutes, or until golden brown.
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Serve warm.