01 - Preheat oven to 350°F. Grease and flour an 8-inch round cake pan thoroughly.
02 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside for later use.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 3-4 minutes. Add eggs one at a time, mixing well after each addition. Blend in chopped lavender and vanilla extract.
04 - Alternately add flour mixture and milk to butter mixture, beginning and ending with flour. Mix until just combined, being careful not to overmix.
05 - Pour batter into prepared pan, smoothing top evenly. Bake for 25-30 minutes or until a toothpick inserted in center emerges clean.
06 - While cake bakes, simmer water, sugar, and lavender buds in a small saucepan for 3 minutes. Strain syrup and set aside to cool slightly.
07 - Allow cake to cool in pan for 10 minutes. If using syrup, poke small holes across surface and lightly brush with warm syrup. Cool completely before glazing.
08 - Whisk powdered sugar, lemon juice, and chopped lavender until smooth and pourable. Drizzle glaze evenly over completely cooled cake. Allow glaze to set before slicing and serving.