| SUN | SOIL MOISTURE | HEIGHT |
|---|---|---|
|
|
|
2' |
| BLOOM | USDA ZONES | BLOOM COLOR |
|---|---|---|
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Antelope-horn or Spider Milkweed is a striking native perennial known for its rounded, star-shaped flower clusters that range from pale green to creamy yellow with deep purple accents. Blooming from late spring into early summer, the blossoms sit atop thick, upright stems surrounded by narrow, arching leaves. The plant gets its name from its distinctive seed pods, which curve outward like antelope horns. Its bold form and drought tolerance make it a standout in prairie, savanna, and dry meadow plantings.
Overall height at 1–2 feet.
This species is a critical larval host plant for several specialist insects, including:
While specific medicinal uses of Antelope-horn or Spider Milkweed are not well documented, related milkweed species were traditionally used by Indigenous peoples for respiratory support, digestive issues, and topical applications. Roots and shoots of other Asclepias species were sometimes prepared as expectorants or poultices. These uses are historical rather than modern clinical practices but reflect the cultural significance of the genus.
Antelope-horn milkweed is a vital nectar source in dry prairies and open grasslands, attracting bees, butterflies, beetles, and other beneficial insects. Monarchs and queens rely on it for both nectar and larval food, making it essential for sustaining their populations in the southern and central United States. Its presence strengthens biodiversity, supports pollinator networks, and contributes to the resilience of native prairie ecosystems.
| Unreported | |
 | Unreported (Absent for area) |
| Native | |
 | Native in state (NA Native and Present in state, but not Present in county) |
 | Native in state and Present in county (NA Native and Present in state, and Present in county) |
 | Rare in state and Present in county (NA Native and Rare in state, and Present in county) |
 | Extirpated/Historic in state/Native (NA Native and Reported in county) |
 | Adventive or Introduced state (NA Native and Adventive in state, and Present in county) |
| Exotic Occurrences | |
 | Exotic in state (Exotic and Present in state, but not Present in county) |
 | Exotic in state and Present in county (Exotic and Present in state, and Present in county) |
| Other | |
 | Noxious in state (Noxious in state, and Present in county) |
 | Questionable Presence (cross-hatched) |
Antelope-horn or Spider Milkweed requires full sun; thrives in hot, open habitats. Moisture needs are low to medium moisture; highly drought tolerant once established. Prefers sandy, rocky, or well-drained loam; intolerant of heavy, wet soils. Very low maintenance; cut back old stems in late fall or early spring. Deer and rabbits generally avoid it.
Please note that Riverside Native Perennials (RNP) only ships our potted “35” product via USPS. We generally can have your plants boxed up and ready to go within two or three days. All other products including our flat of plugs, 1-gallon and 3-gallon containers are only available for nursery pick up in Delaware, OH. For large orders of any of our products we can arrange shipping at an extra cost. Please contact the nursery for additional information.
It’s important to note that when we send plants to you, presentation is everything! We recognize that you’re expecting healthy plants to arrive safely on your doorstep ready to be planted and that is what we’re selling. Further, we want you to know that while we are a fully licensed and inspected perennial nursery in the state of Ohio…we are in Ohio! That means we are subject to Ohio weather. The average frost-free date for our area is May 15. So even though you may live in Florida or California your plants are growing under Ohio conditions and we do not heat our greenhouses due to the expense. Our plants may be slightly delayed but again it’s because we’re in a Zone 5 area. Because we ship nationwide, we ship plants at all times of the year. If it’s winter in Ohio, you’ll be getting dormant plants. If it’s spring or summer in Ohio, you’ll be getting plants of various sizes that are actively growing. Plants shipped during fall in Ohio may be dormant or may be heading towards dormancy. This is all natural and we do not try to modify or prolong the growing season other than to grow them in an unheated greenhouse. Even in an unheated greenhouse our plants are much further along and growing well early in the spring than if they were planted outside in Zone 5. If you would like additional information about sizes for a particular species, please contact us via email.
In 2021 RNP partnered with a shipping professional to design and develop a shipping system that could reasonably be expected to survive the USPS mail room and transportation process. After several design sessions and going back to the drawing board on more than a couple of occasions we created a shipping box system that, to us, is bulletproof. It is strong, lightweight and, to date, has not failed in shipping nearly 150 packages of plants to all corners of the country.
Once selected from our greenhouse benches, your plants are placed into a small plastic bag to maintain moisture during shipping. To keep the soil in the pot we created a cardboard insert that perfectly fits into the top of our 35 containers. The insert has a cutout that surrounds to plant stem without damaging it. The plastic bag and insert are secured by two rubber bands. Each bagged plant is then placed into an individual corrugated cardboard box which perfectly fits the 35 container, and which locks it in place so that it will not move during transit. Four individual boxes are then placed into another, even heavier duty corrugated cardboard master shipping box. The whole effect is that of double boxing your plants. They are safe and secure for the long trip to your home landscape!
The system only works with 4 individual boxes being packed into a single master shipping box so we encourage you to buy four plants or a multiple of four plants. You can buy less than four plants but we will need to send all the cardboard for four plants in order for the shipping system to succeed as designed.
