Cosmos Flower Hardiness Zone. 2 - 11 Whats My Zone. Planting Zone Map Learn what planting zone you live in.
Easy to grow plants flower throughout the summer. The lower the zone number the colder the winter. If you live in very warm winter areas zones 9-11 plants with zones 3-4 ratings are not recommended.
Based on the 1990 USDA Hardiness Zone Map this interactive version covers the state of California which ranges from USDA Zone 4b to USDA Zone 11a.
Soil that is too moist may lead to disease. If the coldest winter temperature expected in your area is -15F zone 5 then any plants rated zones 3-5 will survive the winter temperatures in your area. These tuberous root cosmos grow as perennials in USDA plant hardiness zones 9. California Hardiness Zones for Selected Cities and Locations.