There is growing evidence within the science community that non-native milkweeds may be causing changes in monarch migration habits and increasing the prevalence of a debilitating disease among the adult butterflies. Fortunately, our monarch butterflies in California and other western states are far less migratory than their Eastern brethren, so the issue of effecting their migration habits does not apply as much to our region. The monarchs in California are not those that winter in Mexico or that you read about when you were in school. Ours do not travel from the Northern parts of North America to Southern areas every winter and then back again the following spring. But they do move around regionally, just not like the big migrations of some areas.
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