" only the species come true from seed and then only if hand pollinated.they generally take 2 - 3 years to develop into flowering plants.extract the seeds from the hips when ripe and sow thinly in pots or trays of seed compost in october.place in a cold frame .when the seedlings have developed 2 or 3 true leaves set them straight out into nursery beds.grow on for 2 years before planting out."

the only concern i would have is that the fruit may not have been ripe when picked...as a general rule when seeds can be heard to rattle around inside a fruit then it is ripe .

best of luck !