I found this article very interesting and helpful. Thank you for posting it! In my collection, I have many of the euphorbia species shown here and I really enjoy them. I'm especially proud of my Euphorbia Ledienni crest and Euphorbia Nerifolia crest, both of which are large specimen plants. The nerifolia is getting so large (it's over five feet tall and four feet wide!) that I'm contemplating planting it in my yard. Here in south Texas we rarely get winter temperatures below about 25 degrees, so I'm hoping my decision is the right one. Any thoughts on this? Thanks again for all of your hard work putting this article together. As a journalist, I know what it takes to create an article of this scope, so your efforts are appreciated.