Spread the fresh picked rose petals out over a baking sheet. Don't let the rose petals overlap other petals.
Sit the baking pan aside for a week, either in a cabinet or off to the side on your kitchen counter.
Place the petals, one at a time, into the jar you have chosen. Select a jar that is airtight once the lid is secured.
Secure the lid tightly, allowing the rose petals to be safe from the air. This keeps them in preserved shape after they have been dried to prevent molding.