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Why the five plants depend on the butterfly
Butterflies do not all lay eggs on the same plants. Some caterpillars can feed on only a particular host species; others have a different set of host plants. That makes a generic list of five “butterfly plants” unreliable, especially when the goal is to support a rare species rather than attract adult butterflies generally.
The U.S. Fish and Wildlife Service (FWS) identifies wild blue lupine as the only plant Karner blue caterpillars eat. It identifies Kincaid’s lupine as the host plant Fender’s blue caterpillars depend on, and milkweed as the exclusive caterpillar food of monarchs. These are examples of different species’ needs, not interchangeable choices. FWS: Karner Blue Butterfly; FWS: Protecting Oregon’s rare butterflies and their host plants.
Host plants and nectar plants do different jobs
Host plants feed caterpillars
A host plant is where a butterfly lays eggs and where the resulting caterpillars find the food they need. If a species depends on a particular host, planting flowers that adults visit does not meet that requirement.
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Nectar plants feed adults
Nectar-bearing flowers provide food for adult butterflies. They can complement host plants, but they do not replace them. FWS recommends choosing native plants and flowers that bloom through spring, summer, and fall for monarch garden habitat, helping make adult nectar available across the growing season. FWS: Home gardeners.
Start with the local butterfly and its host plant
- Identify the butterfly you hope to support. Confirm that it occurs in your area and check current range and conservation information.
- Find its documented larval host plant. Do not treat a plant that supplies adult nectar as a substitute for the caterpillar’s host.
- Confirm the exact plant species and local suitability. Common names can cover different plants, and a species useful in one region may be unsuitable elsewhere.
- Add appropriate native nectar flowers. Where suitable for the target species and site, choose flowers with staggered bloom times rather than relying on one short flowering period.
- Match the planting to the site. Check the butterfly’s habitat needs as well as the plant’s growing conditions; a plant list by itself does not recreate habitat.
Karner blue: why the exact lupine matters
Wild blue lupine (Lupinus perennis) is the supported host-plant example for Karner blue caterpillars. FWS notes that the butterfly’s range and the wild-lupine range do not fully overlap, so the plant’s identity alone does not establish that a site is suitable for the butterfly. Its habitat is associated with open savanna and pine barrens, and habitat loss has been linked to land conversion, fragmentation, and fire suppression. FWS: Karner Blue Butterfly.
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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.
- 5 Packets: This collection includes Showy Milkweed Seeds (Asclepias speciosa), Pink Swamp Milkweed Seeds (Asclepias incarnata), White Swamp Milkweed Seeds (Asclepias incarnata), Orange Butterfly Milkweed Seeds (Asclepias tuberosa) & Common Milkweed Seeds (Asclepias syriaca.)
- 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.
- Quality: All Milkweed seeds packaged by Seed Needs are intended for the current and the following growing seasons. All seeds are stored in a temperature controlled facility that is free of significant amounts of moisture.
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FWS also advises gardeners to identify lupine seed carefully and distinguishes wild lupine from large-leafed lupine. “Lupine” on a seed label is not enough to confirm that it is the Karner blue host plant. Check the botanical name and whether the species is appropriate for your location before planting. FWS: Lupine Season!
What to plant when the target is not yet known
If you have not identified a rare butterfly in your area, avoid calling any fixed set of five plants a rare-butterfly garden. Instead, use local native-plant guidance to select plants suited to your region, include both host plants for locally occurring butterflies and nectar flowers for adults, and verify the host relationship before presenting a plant as support for a particular rare species. A regional native-plant group, extension service, or wildlife agency can help confirm species and site suitability.
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A garden helps, but does not replace habitat
Garden plantings can provide resources in a suitable landscape, but they are not a stand-alone recovery plan for a rare butterfly. Karner blue habitat illustrates why: the butterfly is associated with open savanna and pine-barren conditions, and the persistence of those landscapes matters alongside the presence of its host plant. A garden cannot by itself reverse habitat conversion or reconnect fragmented habitat.
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- Milkweed seeds for monarch butterflies: Grow four U.S. native milkweed species for outdoor planting and pollinator habitat: narrow-leaved (Asclepias fascicularis), common (A. syriaca), showy (A. speciosa), and rose or swamp milkweed (A. incarnata).
- Four labeled seed packets: Each variety comes in its own full-color, water-resistant paper packet with 400 mg of seed, planting directions, and a growing guide. Plant markers are included to identify narrow-leaved, common, showy, and rose milkweed.
- Butterfly and pollinator garden: Milkweed provides host plants for monarch caterpillars, while its flowers supply nectar for adult butterflies, bees, and other pollinators. Grow suitable species in garden beds, naturalized areas, or habitat plantings.
- Plant the right milkweed for your region: The four species have different native ranges, moisture preferences, and growing conditions. Check local guidance, follow each packet, and choose the varieties suited to your location before sowing outdoors.
- Heirloom, non-GMO milkweed seeds: All four varieties are heirloom and non-GMO. Cold stratification may improve germination for many native milkweed species. Store unopened packets in a cool, dark, dry place until planting and follow the packet directions.
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- Habitat and Appearance: Pink Swamp Milkweed, scientifically known as Asclepias incarnata, thrives in wetland areas like swamps, marshes, and along riverbanks. It features striking pink to mauve flowers that bloom in clusters, attracting a variety of pollinators.
- Ecological Importance: This plant is a critical host for the larvae of the Monarch butterfly. Its nectar also serves as a vital food source for many pollinators, including bees, butterflies, and hummingbirds, contributing significantly to local biodiversity.
- Growth and Propagation: Pink Swamp Milkweed grows to heights of 2 to 4 feet and prefers full sun to partial shade. It propagates easily from seeds, which need a period of cold stratification to germinate effectively, or through root cuttings.
- Conservation Status: While not currently listed as endangered, habitat loss due to wetland drainage and agricultural expansion poses threats. Conservation efforts often include planting this milkweed in restored wetlands or native plant gardens to support pollinator populations.
- Quality: All seeds packaged by Seed Needs are intended for the current and the following growing seasons. All seeds are stored in a temperature controlled facility that is free of significant amounts of moisture.
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