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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.
This easy-to-grow collection features two annuals (Zinnia and Sunflower) and three perennials (Swamp Milkweed, Rue, and Showy Goldenrod) that offer up a source of food and habitat for giant swallowtail butterflies.
Perennial Rue blooms in late spring to early summer and acts a host plant for giant swallowtails. Swamp Milkweed offers up nectar-rich blooms in the spring, followed by Zinnia and Sunflower in the summer, and Showy Goldenrod offers a source of nectar all the way into the fall. This collection can be planted in the spring and fall, blooming in the first season and for years after, providing a long-lasting habitat for giant swallowtail butterflies.
|Light Requirements||Full Sun|
|Seed Life Cycle||Mixture of Annuals & Perennials|
|Coverage||100-150 sq ft.|
|Days to Bloom||5-7 weeks after germination|
|Soil Moisture||Dry, Average, Moist/Wet, Well Draining|
|Soil Type||Clay Soil, Sandy Soil, Loamy Soil, Drought/Dry Soil, Moist/Wet Soil, Acidic Soil|
|Advantages||Hummingbirds & Butterflies, Easy to Grow, Cut Flowers|
|Ideal Region||Northeast, Southeast, Midwest, Southwest, West, Pacific Northwest|
|Zones||1, 2, 3, 4, 5, 6, 7, 8, 9, 10|
|Is It Storable?||Yes - You can store your seed in any cool (not freezing) dry place that is not subject to extreme temperature variations.|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||Yes|
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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.
Enter your Zip Code to find your USDA Planting Zone
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