Plant lily of the valley in early spring, in a spot that gets partial shade. Keep in mind that over time, this flower is known to spread out. Be very careful if you have pets, because lily of the valley is toxic to both dogs and cats. Hardiness Zones: 3-9 Hardiness Zones: 4-8 If you’re looking for the most fragrant blooms, many English roses make the list, including Heritage and Gertrude Jekyll. Some hybrid tea roses, such as Just Joey and Mister Lincoln, are also aromatic. When buying roses at the florist or market, be sure the stem is firm and green. Petals should fit snugly against the bud and not be too wide open. Hardiness Zones: Depends on variety, but most roses can be grown in zones 7-9 Hardiness Zones: Lavandin grows in zones 5-8 Hardiness Zones: 8-11 Hardiness Zones: Freesias are winter hardy in zones 9-10. Hardiness Zones: 7-10.