Green antelopehorn
Asclepias viridis

Landscape Uses:

Primarily recommended for natural landscapes and habitat restorations. Also butterfly gardens.

Ecological Restoration Notes:

A somewhat rare understory herb in pine rocklands.
Grown by enthusiasts.
Small to medium herb with erect or sprawling stems and oblong leaves.
About 6-24 inches in height. Taller than broad, but then falling over and spreading.
Growth Rate:
Eastern and central United States west to Texas and south to central Florida; disjunct in Miami-Dade County and the Monroe County Keys. In the Monroe County Keys, disjunct from Miami-Dade County to the pine rocklands of Big Pine Key, where very rare.
Pine rocklands.
Moist, well-drained limestone soils, without humus.
Nutritional Requirements:
Low; it grows in nutrient poor soils.
Salt Water Tolerance:
Low; does not tolerate flooding by salt or brackish water.
Salt Wind Tolerance:
Moderate; grows near salt water, but is protected from direct salt spray by other vegetation.
Drought Tolerance:
High; does not require any supplemental water once established.
Light Requirements:
Full sun.
Flower Color:
Green with purple hoods.
Flower Characteristics:
Showy, about 1/2" wide.
Flowering Season:
Winter-summer; peak spring.
Pod (follicle) with wind dispersed seeds, wide at the base and tapering toward the tip.
Wildlife and Ecology:
Larval host plant for monarch (Danaus plexippus) and queen (Danaus gilippus) butterflies; possible larval host for soldier (Danaus eresimus) butterflies. Nectar plant for monarch butterflies. Attracts native bees and other beneficial insects.
Horticultural Notes:
Can be grown from seed.
The plant is poisonous to livestock. See also the Florida Wildflower Foundation's Flower Friday page and Monarchs & Milkweed flyer.

Roger L. Hammer
Lilly Anderson-Messec via her Instagram account @lilliumbyrd.
Lilly Anderson-Messec via her Instagram account @lilliumbyrd.