Preheat oven to 400 degrees.
Roll out one sheet of puff pastry to fit in a standard baking sheet. Prick holes throughout the surface with a fork, then brush with three tablespoons garlic olive oil.
Arrange green onions, chives, and fennel bulb slivers in a garden pattern. Season with salt and pepper. Bake for 25 minutes. Remove from oven, add fennel fronds and squash blossoms and bake for another 5 minutes.
Remove from oven and add additional edible petals and microgreens as desired. Cool slightly and serve.