For monarch habitat, plant a milkweed species native to your region whenever possible. Tropical milkweed (Asclepias curassavica) is a host monarchs use, but in mild-winter areas its persistent foliage can support winter breeding and help sustain transmission of the parasite OE. If you already grow it, management depends on where you live: fall and winter cutbacks are recommended in much of the southern U.S. and California, but not south of Orlando in south Florida.
Which milkweed should I plant for monarchs?
Choose a species native to your area, then match it to your garden’s sun, soil, and moisture conditions. “Native” is regional: a milkweed native somewhere in North America is not necessarily native or well suited to your location. Monarch Joint Venture recommends local native species because they fit the climate and generally need less maintenance. Its current FAQ describes about 110 milkweed species in North America; monarchs feed almost exclusively on plants in the genus Asclepias. Monarch Joint Venture’s milkweed FAQ explains the regional approach.
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The U.S. Fish & Wildlife Service names swamp, butterfly, common, whorled, and showy milkweed as examples of native varieties. Those are options to investigate, not a universal planting list: check whether a species naturally occurs in your area and whether its soil and moisture needs suit the site. A local native-plant nursery or seed producer can help you select regionally appropriate seed or plugs. The agency’s guidance is at You can help save the monarch.
Native and tropical milkweed compared
| Consideration | Regional native milkweed | Tropical milkweed |
|---|---|---|
| Fit to location | Choose a species native to your region and suited to your site; local climate fit can mean less maintenance. | Non-native to the United States; it is commonly grown in gardens. (Monarch Joint Venture, monitoring-project guidance.) |
| Winter foliage | Seasonal growth generally dies back; the timing varies by species and climate. | Can remain leafy through mild winters; in northern breeding areas it may die back naturally after freezing. (Monarch Joint Venture, tropical milkweed FAQ.) |
| Monarch use | Native milkweeds provide host plants; the right species depends on local conditions. | Monarchs use it as a host plant, so it is not useless to them. |
| Year-round availability and disease concern | Seasonal dieback limits continuous host foliage in winter. | Persistent foliage may support winter breeding in parts of the southern U.S. and California. Infected monarchs can contaminate milkweed with OE, creating opportunities for transmission when breeding continues on persistent plants. |
| Management | Select for local conditions and follow seasonal growth patterns. | In the southern U.S. and California, guidance recommends fall and winter cutbacks; south Florida south of Orlando is an exception to that cutback advice. |
Is tropical milkweed harmful to monarchs?
The concern is not that monarchs cannot use tropical milkweed. They do. The issue is that persistent leaves in mild-winter regions can make host plants available when local native milkweeds have died back. Monarch Joint Venture reports strong evidence that year-round host plants cause some monarchs to skip long-distance migration and reproduce through winter in parts of the southern U.S. and California. Its monitoring project’s guidance describes the seasonal and regional concern.
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- Pollinator Attraction: Milkweed flowers are known for attracting a variety of pollinators, including bees, butterflies, and hummingbirds. They produce a sweet nectar that is particularly enticing to monarch butterflies, which lay their eggs exclusively on milkweed plants.
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- Ecological Importance: Milkweed is crucial for the survival of monarch butterflies, providing not only nectar but also foliage for caterpillars to feed on. The presence of milkweed in an ecosystem supports biodiversity and is vital for the monarch's life cycle.
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Winter breeding matters because of Ophryocystis elektroscirrha (OE), a parasite of monarchs. Infected butterflies can leave spores on milkweed; monarchs that feed on contaminated plants may become infected. Repeated breeding on foliage that remains available can help sustain opportunities for transmission. Migration reduces OE incidence in migratory populations, but studies comparing populations do not establish the risk from any particular backyard plant or quantify the effect for every region.
- Monarch Joint Venture’s 2021 fact sheet reports OE infection in 70% of sampled non-migratory monarchs in coastal California, compared with 9% of migratory monarchs sampled in Mexico and 15% of migratory monarchs sampled in the northern U.S. and Canada. These are specific sampling comparisons, not current prevalence estimates for every population or garden. Read the fact sheet.
- A 2024 USDA Natural Resources Conservation Service and U.S. Fish & Wildlife Service conference opinion, summarizing Satterfield et al. (2016), says OE infection rates in California were nine times higher in non-migratory monarchs than in migratory monarchs.
- The same 2024 opinion, summarizing Satterfield et al. (2018), says migrants at Texas sites with resident monarchs were 13 times more likely to be infected with OE.
Those study comparisons support concern about resident breeding and OE, but they should not be read as a measured effect of an individual garden planting. The conference opinion is available from the USDA Natural Resources Conservation Service.
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- AN ESSENTIAL FOR EVERY GARDEN. Milkweed is the cornerstone of a healthy pollinator ecosystem. These plants are vital for the survival of Monarch populations, providing a sanctuary where they can flourish. By planting milkweed wherever possible, you add multi-faceted color to your landscape while offering critical nectar and pollen resources to a diverse array of bees and butterflies.
- The legendary Monarch butterfly is a remarkably selective eater. During their caterpillar stage, they rely exclusively on milkweed as their host plant. This is not just a preference but a biological necessity, as larvae cannot survive without it. The large, nutrient-rich foliage serves as a vital food source and a lifeline for the next generation of butterflies.
- A VITAL BOND FOR NATURE. Every variety of milkweed provides immense value to the Monarch life cycle. These plants offer the specific nutrients needed for this iconic species to thrive. Monarchs rely solely on milkweed to lay their eggs and feed their larvae, which eventually create their intricate chrysalises right on the plant. This interdependent relationship is a crucial part of our natural world, and by supporting their habitat, we foster a healthier environment for everyone.
- THE FIVE STELLAR VARIETIES. BUTTERFLY MILKWEED offers compact growth up to 3 feet with striking fiery clusters of gold and orange. These vibrant umbels are packed with nectar and a light candy-like scent. Unlike its relatives, it lacks the milky sap and is exceptionally drought-tolerant.
What should I do with tropical milkweed I already have?
In the southern U.S. and California, cut it back during fall and winter, timing the pruning to mimic the period when native milkweed is unavailable in your area. Monarch Joint Venture’s fact sheet advises cutting stalks to about 6 inches and repeating the cut every few weeks as leaves regrow. Gradually replace the plants with regionally native milkweeds as suitable species become available. See the detailed tropical milkweed guidance.
South Florida exception
The cutback recommendation does not apply south of Orlando, where a distinctive, long-established non-migratory monarch population exists. Native milkweed planting is still encouraged there; the exception is specifically to the cutback advice, not a recommendation that tropical milkweed is native. The geographic qualification appears in the Monarch Joint Venture fact sheet.
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Northern breeding areas
In northern parts of the monarch breeding range, tropical milkweed may die back naturally after freezing and may therefore pose fewer problems than it does where foliage persists through winter. Regional native species remain the preferred choice where possible. Conditions vary, so base management on whether the plant actually stays leafy through winter in your location.
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- Check regional distribution. Start with native milkweed lists or guidance for your state or local area; do not assume a species is appropriate just because it grows elsewhere in North America.
- Match the plant to the site. Check soil and moisture needs as well as available sun, then ask a local native-plant nursery or seed producer for a species and seed source suited to your conditions.
- Replace gradually. Where tropical milkweed is already established in an area covered by fall and winter cutback guidance, use locally appropriate native plants as they become available rather than leaving persistent foliage unmanaged.
Monarch Joint Venture also recommends native milkweeds for gardening and restoration projects in its Planting Monarch Habitat FAQ.
Quick Recap
Best Value
- MONARCH BUTTERFLY HABITAT: Common milkweed (Asclepias syriaca) is a host plant for monarch butterfly larvae. Planting this native wildflower helps support monarch populations by providing a food source for caterpillars. Suitable for USDA Zones 3–9.
- FRAGRANT BLOOMS: This variety grows 3–5 ft. tall and produces scented pink to mauve flower clusters, 2–4 inches wide. Grows best in full sun to partial shade. The flowers attract various pollinators, including native bees, honeybees, hummingbirds, and hoverflies.
- PERENNIAL GROWTH HABIT: As a hardy perennial in USDA Zones 3–9, common milkweed typically returns each year through rhizomes and natural reseeding. Seeds are open-pollinated.
- PLANTING AND GERMINATION: Seeds can be direct sown in fall to allow for natural cold-stratification, or cold-stratified in the refrigerator for 30 days prior to spring planting. Plant seeds 1/8–1/4 inch deep in well-drained soil. Germination generally occurs at 60–70°F.
- ADAPTABLE TO VARIOUS SOILS: Once established, common milkweed is drought-tolerant and performs well in average to poor, well-drained soil. Requires little supplemental watering or fertilization once established. Seed pods may remain through the fall to provide interest in the landscape.
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