The plants last about five years and grow to be a sizable shrub. Zone 9" on Pinterest. Because of the excessive heat and higher potential for shock and drought, avoid planting shade … Looking to fill your garden in growing zone 9? These plants are specially selected to flourish within zone 9. You can spend the time creating a garden … See more ideas about Plants, Planting flowers, Shade plants. U.S. Department of Agriculture plant hardiness zones 9a and b reach across the nation's southern section. In zones 9 to 11, you can plant artichokes in fall. Stunning thistle flowers will emerge in spring. The ideal time to plant shade trees in USDA growing zone 9 is in fall. These floriferous shrubs are used extensively in … Join the foodscaping revolution when you plant artichokes. Native Plants for Zone 9. Wait till spring in colder zones. However winter through early spring is also an excellent time of the year to plant in subtropical climates. When to Plant Fast Growing Shade Trees in Zone 9. This is a list of heat tolerant Hydrangea varieties that will grow in USDA Planting Zone 9, where low winter temperatures can go down to 20 degrees F winter.