Hummingbird and Butterfly Gardening: 2013 Monarch Migration, 2 by pollengarden

pollengarden wrote:
Historic? I can do Historic ...
These are excerpts from a book published in the 1950's compiled from the work of 3 lepidopterists in Colorado dating back into the 1930's and earlier.
The book is somewhat out-dated - not much was known about the larva and host plants for a lot of Butterflies, and the botanical names of some of the butterflies has changed. With Monarchs, a lot more has been learned about the migratory routes since then.
But there is a lot to be said for experience - for example, where the author says the number of Queens in Colorado relates directly to the weather in Texas.