1.
Hardy to Zone 2, monkshood is a good alternative to hollyhocks or foxgloves in a less-forgiving climate.
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11.
USDA Zones 4 to 9, Irises come in a wide array of colors — from nearly translucent, pale yellow to a murky, dark purple.
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13.
Popular perennial for the shade garden, the hosta is nearly impossible to kill. USDA Zones 3 to 9.
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20.
Attracts bees, butterflies and hummingbirds, full sun or light shade, USDA Zones 4 to 9
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