Preheat the oven to 350 degrees F (175 degrees C).
Pour oats, almonds, coconut, cashews, hazelnuts, sunflower seeds, and pumpkin seeds onto a rimmed baking sheet. Add maple syrup, oil, and salt; toss together until evenly coated.
Bake in the preheated oven, tossing once, until golden and crisp, 25 to 30 minutes. Add cranberries and hibiscus petals and toss with a spoon to combine. Let cool.