Peonies are old-fashioned favorites in the garden. Large, petal-filled blossoms grace the garden with a rich color palette that includes white, pink, red, salmon and deep purple. Tuck potted peony plants into the garden in fall or spring. Bareroot peonies do best when planted in fall. Peonies are long-lived plants that typically survive for generations and make fantastic cut flowers. Zones 2-8.