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Asclepias viridis (Green antelopehorn Milkweed)

Asclepias viridis (Green antelopehorn Milkweed)

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Pure Live Seed

Seed is provided in Pure Live Seed (PLS) unless otherwise stated.

Pure Live Seed (PLS) expresses the viable seed content of a seed lot using its purity and germination or viability test results. It helps you compare seed lots and calculate how much bulk seed is needed to meet a specified PLS planting rate.

PLS weight and bag weight

PLS weight is not the same as the total weight of seed in a bag. For example, a lot with 80% purity and 75% viability contains 60% PLS: 80 × 75 ÷ 100 = 60. Supplying 10 lb PLS from that lot requires about 16.67 lb of bulk seed.

Use the current seed test and the stated basis of the mix specification. Germination calculations may include applicable hard or dormant seed. Seed-count estimates also require the number of seeds per pound; PLS alone does not provide a seed count.

What to check when buying a mix

Check whether each rate is stated in PLS pounds, bulk pounds, or a combination. A mix with both bases should not be described as having an all-PLS total.

PLS does not remove weed seeds or guarantee establishment. Review the seed label and analysis for weed content, and match site preparation, planting conditions and follow-up management to your project.

Sources: USDA NRCS, Understanding Pure Live Seed and The Importance of Seed Quality for Natural Resource Conservation.

Weight Conversions lbs. to oz.

0.01 pounds = 0.16 ounces

  • 0.1 pounds = 1.6 ounces
  • 0.25 pounds  = 4 ounces
  • 0.5 pounds = 8 ounces
  • 0.75 pounds = 12 ounces
  • 1.00 pounds = 16 ounces

Green antelopehorn milkweed has green flowers topped with purple hoods. Give it sun and drainage; a Chicago-region coefficient is not established for this listing.

Sun exposure for Asclepias viridis: full sun. Reported soil conditions: good drainage, occasionally dry. Reported height: 1 ft. 6 in. - 2 ft. 6 in..

Plant specifications

Key growing facts

Sunlight Full sun
Soil moisture Reported soil conditions: good drainage, occasionally dry
Height 1 ft. 6 in. - 2 ft. 6 in.
Bloom season Spring; Summer
Show / hide ▾Growing & planting details
Soil pH Published cultivation guidance lists neutral soil conditions; no optimal numeric interval is established.
Cultivation hardiness zones Zones 4a–9b (general cultivation guidance)
Deer browsing Deer resistance reported in cultivation guidance; browsing remains possible.
Plant toxicity Poison characteristics are reported; listed parts: flowers, leaves, stems. Pet safety is not established.

Plant identification & seed reference

Botanical name Asclepias viridis
Other common names Green Antelopehorn; Green Milkweed; Spider Milkweed
Plant family Apocynaceae

Planting, growth & seasonal care

Flowering season: spring; Summer. Use this timing when planning seasonal interest with the other plants in the bed.

Browsing guidance: Deer resistance reported in cultivation guidance; browsing remains possible.

Use the selected product option to confirm the supply format and quantity. For a mixed planting, calculate the order from the actual species and layout; a plant’s mature height alone does not determine a seed rate or plug spacing.

Show / hide ▾Plant communities & associatesNo verified list yet

A species-level list has not yet been verified for this listing.

Show / hide ▾Native range & C-value

State nativity describes a broad range. Use the Chicago-region assessment for local context; a state listing does not establish county nativity.

C-value* — Illinois regional assessment 6
Native range — U.S. states Alabama; Arkansas; Florida; Georgia; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Mississippi; Missouri; Nebraska; Ohio; Oklahoma; South Carolina; Tennessee; Texas
County nativity Not yet verified; occurrence records do not establish nativity.

Regional assessment notes

This taxon is native to parts of the United States. A matching Flora of the Chicago Region (2017) assessment has not been verified for this listing. Any regional fallback rating is identified separately in the table above.

These records describe botanical distribution. They do not establish county occurrence or suitability for every site; an unlisted state is not proof of absence.

Show / hide ▾Pollinators & wildlife

Caterpillars recorded on Asclepias — genus-level evidence

These records concern the plant genus Asclepias, not necessarily Asclepias viridis. They do not establish a host relationship for every species in the genus, specialist status, or occurrence at your location. The selected insects are listed as native in the source’s North American study area.

Butterfly: Danaus eresimus (Soldier, Tropical Queen); Danaus gilippus (Queen ); Danaus plexippus (Monarch ); Strymon melinus (Gray Hairstreak ).

Macromoth: Cerathosia tricolor (Tricolored Angel, Etched Cerathosia); Cycnia collaris (Unexpected Cycnia ); Cycnia tenera (Delicate Cycnia, Dogbane Tiger Moth ); Ectypia clio (Clio Tiger Moth); Euchaetes egle (Milkweed Tussock Moth or Milkweed Tiger Moth ); Euchaetes elegans; Hyalophora cecropia (Cecropia Silkmoth, Cecropia Moth ); Lerina incarnata (Crimson-Bodied Lichen Moth); Melanchra adjuncta (Hitched Arches); Papaipema nebris (Stalk Borer); Phragmatobia lineata (Lined Ruby Tiger Moth ); Pygarctia eglenensis; Pygarctia roseicapitis (Red-Headed Pygarctia); Pygarctia spraguei (Sprague's Pygarctia Moth); Pygoctenucha terminalis; Pyrrharctia isabella (Isabella Tiger Moth, Banded Woolybear ); Spodoptera frugiperda (Fall Armyworm Moth); Trichordestra legitima (Striped Garden Caterpillar Moth).

Micromoth: Agathodes monstralis (Sky-Pointing Moth); Platynota flavedana (Black-Shaded Platynota).

Show / hide ▾Frequently asked questions

What are the ideal growing conditions for Green antelopehorn Milkweed?
Light: Full sun. Soil moisture: Reported soil conditions: good drainage, occasionally dry.

Is Green antelopehorn Milkweed deer and herbivore resistant?
Deer resistance reported in cultivation guidance; browsing remains possible. Even plants described as resistant may be browsed. Use physical protection where deer damage is a concern.

When should I expect Green antelopehorn Milkweed to bloom?
Typical flowering period: Spring; Summer. Timing varies with location and weather.

Show / hide ▾Sources & ecological notes

Native range & ecological ratings: Illinois FQA (1997; 2020 family update); Kew WCVP / Plants of the World Online.

Growing conditions & other references: NC State Extension Plant Toolbox.

Wildlife records: Shropshire & Tallamy: caterpillar hosts (2025).

Native range does not identify the origin of the seed or plants offered. Community and wildlife records apply to the locations and conditions described.

Research notes & credits

U.S. state nativity: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew, 4 June 2026 release, under Asclepias viridis. © The Trustees of the Royal Botanic Gardens, Kew; CC BY 3.0. Native records selected; introduced, doubtful and extinct records excluded. Kew cannot warrant the quality or accuracy of these data; no endorsement is implied. State nativity is separate from Chicago-region nativity, county occurrence and the origin of nursery stock.

Additional reference: Open Database License 1.0.

Data adapted from Shropshire, K.J. & Tallamy, D.W. (2025), Lepidoptera of North America, north of Mexico, supplementary material 1. This selected and reformatted host dataset is available under the Open Database License 1.0. No endorsement implied.

Genus-level research records

These records concern the plant genus. They do not establish that each insect feeds on this particular plant species.

Record ID Scientific insect name Common name Source group Plant genus
203784 Danaus eresimus Soldier, Tropical Queen butterfly Asclepias
203785 Danaus gilippus Queen butterfly Asclepias
203786 Danaus plexippus Monarch butterfly Asclepias
211907 Strymon melinus Gray Hairstreak butterfly Asclepias
202607 Cerathosia tricolor Tricolored Angel, Etched Cerathosia macromoth Asclepias
203710 Cycnia collaris Unexpected Cycnia macromoth Asclepias
203712 Cycnia tenera Delicate Cycnia, Dogbane Tiger Moth macromoth Asclepias
204399 Ectypia clio Clio Tiger Moth macromoth Asclepias
205052 Euchaetes egle Milkweed Tussock Moth or Milkweed Tiger Moth macromoth Asclepias
205053 Euchaetes elegans macromoth Asclepias
207034 Hyalophora cecropia Cecropia Silkmoth, Cecropia Moth macromoth Asclepias
207674 Lerina incarnata Crimson-Bodied Lichen Moth macromoth Asclepias
208224 Melanchra adjuncta Hitched Arches macromoth Asclepias
209281 Papaipema nebris Stalk Borer macromoth Asclepias
209964 Phragmatobia lineata Lined Ruby Tiger Moth macromoth Asclepias
210765 Pygarctia eglenensis macromoth Asclepias
210771 Pygarctia roseicapitis Red-Headed Pygarctia macromoth Asclepias
210772 Pygarctia spraguei Sprague's Pygarctia Moth macromoth Asclepias
210774 Pygoctenucha terminalis macromoth Asclepias
210884 Pyrrharctia isabella Isabella Tiger Moth, Banded Woolybear macromoth Asclepias
211673 Spodoptera frugiperda Fall Armyworm Moth macromoth Asclepias
212592 Trichordestra legitima Striped Garden Caterpillar Moth macromoth Asclepias
200474 Agathodes monstralis Sky-Pointing Moth micromoth Asclepias
210196 Platynota flavedana Black-Shaded Platynota micromoth Asclepias

Growing guidance: Illinois Extension — Keeping deer out of the yard and garden. Selected facts in original wording. General deer advice is not a species resistance rating.

* Illinois statewide 1997 assessment, 2020 family-name update — fallback. Exact statewide taxon; not a Chicago-region rating. This value is not presented as a Flora of the Chicago Region rating.

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