Desert Milkweed Plant Care
Asclepias erosa Torr.
Updated · Sources · How we source care data
Asclepias erosa is a species of milkweed known commonly as desert milkweed. It is native to southern California, Arizona, and northern Baja California, where it is most abundant in the desert regions.
Every 7–10 days
Full sun
60–85°F
40–60%
At a glance
How do you care for Desert Milkweed?
Water Desert Milkweed every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 60–85°F (16–29°C) and 40–60% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
Where Is the Desert Milkweed Native To?
What Is the Desert Milkweed?
Desert Milkweed (Asclepias erosa) belongs to the Apocynaceae family within the Asclepias genus. Desert Milkweed is native to southern California, Arizona, and northern Baja California. Desert Milkweed is also known as Desert Butterfly Weed.
Desert Milkweed displays an upright, clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Desert Milkweed produces clusters of small, colorful flowers in shades of pink, orange, or yellow.
Leaf size: approximately 6 inches.
How Often Should You Water a Desert Milkweed?
Asclepias erosa requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Desert Milkweed Need?
Desert Milkweed thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Desert Milkweed Prefer?
Asclepias erosa grows best at temperatures of 60–85°F. Desert Milkweed prefers humidity levels of 40–60%.
Temperature
60–85°F
Humidity
40–60%
What Soil Mix Works Best for a Desert Milkweed?
Well-draining sandy loam with some organic matter. Good drainage is essential for Desert Milkweed to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Desert Milkweed?
Feed Desert Milkweed every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Desert Milkweed?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Desert Milkweed?
Desert Milkweed can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to butterfly weed plant care, which shares the same genus.
Is the Desert Milkweed Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Desert Milkweed?
Desert Milkweed is susceptible to aphids, milkweed bugs, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Desert Milkweed Need?
Desert Milkweed grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Desert Milkweed is native to southern California, Arizona, and northern Baja California. In cooler regions, grow Desert Milkweed as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Desert Milkweed is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Asclepias genus — compare its care with other Asclepias species on PlantoScan.
Asclepias is part of the Apocynaceae plant family — browse all Apocynaceae genera and species.
Desert Milkweed thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Asclepias erosa Torr., family Apocynaceae (first published in Rep. U.S. Mex. Bound. 2(1): 162 (1858)) — World Flora Online record, IPNI name record.
- Pet toxicity: Desert Milkweed is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 13a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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