Showy Milkweed

Asclepias speciosa
 
This is the most common Milkweed in the Pacific Northwest.  Plants grow to 3-4 feet mostly on a single stem.  I have not seen a Monarch Butterfly on these plants in my garden but they attract native Butterflies and all sorts of other pollinators.  And who knows- If Monarchs were to come by someday I'd love to have Milkweed growing in the garden to welcome them. 
 
The seeds are a bit finicky to germinate but not impossible.  Plant in the fall in pots and leave outdoors to naturally stratify.  Or cold stratify them in the refridgerator for 30 days in a moist paper towel or in moist sand.   Then put them in pot and cover lightly with soil to germinate. May take up to 3 weeks.  Give them a chance to get large in the pot before transplanting.  Alternately, gently press the seeds into the soil in January, keep the spot weeded and wait for germination.  Perennial.  
 
Packet contains ~25 seeds