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Horsetail Milkweed, Whorled Milkweed

Asclepias subverticillata

Details & Attributes


Plant Type(s) Perennial
Native to Arizona Yes!
Water Needs Moderate-high
Sun Full sun in higher elevations, shade in lower elevations
Pollinators Butterflies
Has Spines No
Size
In relative feet, width by height
2 × 3
Freeze Tolerant No
Flowering Season June-September
Flower Color White
Minimum Temperature Range 0-10 °F
Leaf Description Long and narrow
Fruit A dry capsule that stays on the stalk.
Longevity
In years
5
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Range Map View SEINet Range Map
Elevation Range 3000-8000 ft.
Ethnobotany Often considered to be highly poisonous. It was used to help stimulate breast milk; seed silk used; the first buds eaten; the pods were eaten, used for clothing, and made into prayer sticks.
Description Horsetail Milkweed is absent from the low desert but thrives in wet meadows, woodlands, and disturbed areas. This species is considered the number one Monarch butterfly larval food plant in Arizona. This plant would be appropriate for higher elevation gardens or in landscapes with greywater or rain catchment at lower elevations.