One of the most widely recognized butterflies in North America, the monarch, is disappearing fast. Most of that decline is blamed on changing land use, but property owners can help shore up the population by setting aside monarch “way stations” filled with milkweed and other nectar-rich plants.

See article below.

http://www.ctvnews.ca/sci-tech/more-milkweed-habitats-needed-for-monarch-butterflies-professor-says-1.2468752