Asclepias sanjuanensis Plant Care
Asclepias sanjuanensis K.D.Heil, J.M.Porter & S.L.Welsh
Updated · Sources · How we source care data
Asclepias sanjuanensis, the San Juan milkweed, is a species of milkweed native to northwestern New Mexico. This species is restricted to the Four Corners area and is only present in San Juan County in New Mexico.
Every 7–10 days
Full sun
60–85°F
40–60%
At a glance
How do you care for Asclepias sanjuanensis?
Water Asclepias sanjuanensis 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 Asclepias sanjuanensis Native To?
What Is the Asclepias sanjuanensis?
Asclepias sanjuanensis (Asclepias sanjuanensis) belongs to the Apocynaceae family within the Asclepias genus. Asclepias sanjuanensis is native to northwestern New Mexico.
Asclepias sanjuanensis displays an upright, clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Asclepias sanjuanensis produces clusters of small, colorful flowers in shades of pink, orange, or yellow.
Leaf size: approximately 6 inches.
How Often Should You Water a Asclepias sanjuanensis?
Asclepias sanjuanensis 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 Asclepias sanjuanensis Need?
Asclepias sanjuanensis thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Asclepias sanjuanensis Prefer?
Asclepias sanjuanensis grows best at temperatures of 60–85°F. Asclepias sanjuanensis prefers humidity levels of 40–60%.
Temperature
60–85°F
Humidity
40–60%
What Soil Mix Works Best for a Asclepias sanjuanensis?
Well-draining sandy loam with some organic matter. Good drainage is essential for Asclepias sanjuanensis to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Asclepias sanjuanensis?
Feed Asclepias sanjuanensis 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 Asclepias sanjuanensis?
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 Asclepias sanjuanensis?
Asclepias sanjuanensis can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to tropical milkweed plant care, which shares the same genus.
Is the Asclepias sanjuanensis 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 Asclepias sanjuanensis?
Asclepias sanjuanensis 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 Asclepias sanjuanensis Need?
Asclepias sanjuanensis grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Asclepias sanjuanensis is native to northwestern New Mexico. In cooler regions, grow Asclepias sanjuanensis as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Asclepias sanjuanensis 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.
Asclepias sanjuanensis thrives in bright light and direct sun — see other bright-light plants.
More Asclepias Species
Other Asclepias species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Asclepias sanjuanensis K.D.Heil, J.M.Porter & S.L.Welsh, family Apocynaceae (first published in Great Basin Naturalist 49: 100 (1989)) — World Flora Online record, IPNI name record.
- Pet toxicity: Asclepias sanjuanensis 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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