In a medium bowl, blend together the sugar and cornstarch.
Place the blueberries in a large bowl along with the orange juice, orange zest, and chopped lavender.
Add the cornstarch/sugar mix on top and use a rubber spatula to evenly distribute.
Remove the pie crust from the refrigerator and pour the pie filling on top.
Use the second half of the dough to roll and cover the pie (or make your own design), seal the edges.
Place back in the refrigerator for 45-60 minutes.
When ready to bake, preheat oven to 425
Line a large cookie pan with parchment paper and place the pie on top. Brush the pie with egg wash and place it in the lowest oven rack.
Bake for 15 minutes, then reduce temperature to 350F and bake for additional 35-40 minutes.
The pie is ready when the filling is bubbling and the crust is golden brown.
Remove from oven and let 2 hours to cool before slicing.