First, do a state search.
http://plants.usda.gov/checklist.html
Put in Asclepias and then click your state. My state is Virginia. Here are the results for Virginia:
http://plants.usda.gov/java/stateSearch ... eField.y=5
I'm starting a current plant/seed list for places to buy milkweed (Asclepias). If you know of a good source that I haven't list, then please share it. Just reply to this topic and any input would be appreciated. I've been working on a native milkweed collection at the botanical gardens where I volunteer (Meadowlark Botanical Gardens). You won't find the milkweed planted in one location. Some of it will be woodland, others wetland, others meadow.
http://www.prairiemoon.com/seeds/wildfl ... n=1&page=2
Prairie Moon
Check website for availability and pricing
Asclepias amplexicaulis (Sand Milkweed)
Out of stock
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Asclepias exaltata (Poke Milkweed)
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Asclepias hirtella (Tall Green Milkweed)
Out of stock
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Asclepias incarnata (Swamp Milkweed)
Swamp Milkweed is deer resistant and grows in moist to average soils, blooming in July and August.
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Asclepias pumila (Plains Milkweed)
NEW! Plains Milkweed is a drier, western Milkweed species found north from MT/ND and south to NM/TX.
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Asclepias purpurascens (Purple Milkweed)
Purple Milkweed flowers will attract a variety of nectar seeking insects from the very small to large, Bumble Bees and, of course, Monarchs.
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Asclepias speciosa (Showy Milkweed)
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Asclepias sullivantii (Prairie Milkweed)
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Asclepias syriaca (Common Milkweed)
The fragrance of Common Milkweeds' flower is very delicate and pleasing.
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Asclepias tuberosa (Butterfly Weed)
Out of stock
This is a great Milkweed for a sunny location in a dry area. Butterfly Weed's vivid orange color, low mounded profile, and ability to attract and sustain butterflies make this plant a well known favorite for all types of Gardens.
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Asclepias verticillata (Whorled Milkweed)
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Asclepias viridis (Spider Milkweed)