« Back to main plant list

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
In relative feet, width by height
2 × 3
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.
In years
View on SEINet View SEINet Entry
Range Map View SEINet Range Map
Elevation Range 3000-8000 ft.
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.