Milkweed-Whorled (Asclepias verticillata)
Has very skinny, "whorled" leaves with clusters of white flowers that reached a height around 2'. Its foliage is valuable to butterfly larvae, especially monarchs, since it blooms late in the season. Likes hot dry soils, but tolerates moist garden soils. Perennial.
Sun Exposure - Full, Partial
Soil Moisture - Medium, Medium-Dry, Dry
Height - 2 feet
Bloom Time - July, August, September
Bloom Color - White
Photo courtesy of Prairie Moon.