If you intend them as an attractive garden decoration, they work superbly. If you'd like to provide shelter to butterflies, these two articles say they most likely will not use them. However, several of our visitors have been successful.
Hibernation Boxes: Do They Work?
Butterfly Houses
If you'd like to build one, go here: Butterfly House Plans
For info on where to put it in your garden, go here: Where to Place your Butterfly House
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