I've been watching this post for some time waiting to see if anyone has any ideas on the euphorbia problem. I have also had euphorbia die back for no apparent reason and am totally baffled. I work in the gardening industry and have posed the question to our grower, our customers, etc....but no go. Many of us have this dieback, but no idea why.

At first I thought maybe it was the hot dry summers we have...maybe they just don't like the combination of high temperatures, humidity and sporadic hand watering...which is nothing like rain! Mine always seem to do better in the spring and fall, look nice in the winter, and fail in the summer.

Hope you get a few other responses. I love euphorbias and would like to find a niche for them!