As the gpnmag.com article about ‘Monarch Promise’ states,
"This very special Asclepias curassavica has beautiful green and white variegated foliage that is tinged with red, orange and pink leaf tips.... It was found by a butterfly breeder in Florida because she used it on her farm for its food source for her Monarch caterpillars."
It is just a spontaneous mutation, or "sport," of Asclepias curassavica that occurred on its own. It is not a hybrid or the result of humans tampering with its genetics.
http://www.google.com/patents/...
