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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).
Asclepias | Milkweed
Planting Milkweed (Asclepias) is essential to creating a habitat for the beloved Monarch butterfly's survival, as they are the only plants on which Monarch caterpillars will feed. Butterfly Weed (Asclepias tuberosa), Swamp Milkweed (Asclepias incarnata) are considered the best varieties for an ornamental garden. Showy Milkweed (Asclepias speciosa) and Common Milkweed (Asclepias syrica) are easy to grow, spreading by underground roots, and are best planted in peripheral areas of the landscape, where "weediness" won't be a problem.
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