Preheat oven to 400 degrees. Line a baking sheet with parchment paper.
In a large bowl, whisk together the flour, baking powder, salt, and ground lavender.
Using a pastry cutter or a fork, cut the butter into the flour mixture until it resembles coarse crumbs with pea-sized butter pieces.
In a separate bowl, whisk together the honey, heavy cream, egg and vanilla until smooth.
Pour the liquid mixture over the flour mixture and stir gently with a fork until just combined. Do not overmix! The dough should be slightly crumbly but hold together.
Turn the dough onto a lightly floured surface and knead 3 or 4 times to bring it together. Pat into a disk about 1-inch thick, then cut it into 8 wedges.
Place wedges 2 inches apart onto prepared baking sheet. Brush the tops with a little extra heavy cream.
Bake for 10-15 minutes, or until the scones are golden brown around the edges. Cool on the baking sheet for 5 minutes before moving to a wire rack.
While the scones cool, prepare the glaze: In a small bowl whisk together the powdered sugar, honey, heavy cream, lavender and lemon juice. Adjust consistency with additional lemon juice if necessary.
Drizzle the glaze over the slightly cooled scones. Allow the glaze to set for 10 minutes before serving.