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USDA Hardiness Planting Zones
To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
- If the coldest winter temperature expected in your area is -15�F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
- If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
Helianthus | Sunflower
Big and vigorous, perennial Maximilian’s Sunflower (Helianthus maximiliana) is a perennial native plant that thrives in harsh growing conditions and poor soils (including heavy clay). It is a good perennial for habitat gardens and blooms in the late summer/early fall. It should be used along fences, against walls, sheds and other places where its large size is most useful. A High Country Gardens specialty, we offer three improved cultivars of Maximilian's Sunflower.
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