Euphorbia Trigona brown patches #609150
Asked December 28, 2019, 4:08 AM EST
Hi there, my friends gave me this African Milk Tree (euphorbia trigona) and it had some small brown patches that I thought were sunburn bc it was in a window & I had read some about that. My baby has grown about 3x the size it was a little less than 2 years ago. The brown patches haven't taken over, but have spread some and now it looks like spotting is happening in different parts. I really don't want to chop it all apart because it still looks so healthy otherwise. I've read about corking, so it could be that, but I just can't tell. The other side looks great still. Please help if you can! Thank you.
Multnomah County Oregon
Thank you for your question. These are ‘touchy’ plants. Here is a Q & A about similar issues that may help: https://ask.extension.org/questions/441590 Good luck!
Thanks, I've already read that. Am hoping that someone can tell if it's corking or scale or a fungus or sunburn because I don't want to cut it all down. Cuttings I have taken have rooted & are very healthy so I don't want to chop them up unless I need to. Hoping someone can narrow down the problem. Thanks again for your response. Including an image of another side that shows how healthy, green & leafy they are.
Do you rotate your plant so that all sides get the same amount of light?
There is a variety of E. trigona, E. trigona rubra, that has red stems and leaves: https://apps.cals.arizona.edu/arboretum/taxon.aspx?id=1117 According to this, and several other experts on this plant, the amount of sun exposure may cause a color change, especially in winter. It may be similar to the opposite color change described here: https://laidbackgardener.blog/2018/12/09/when-a-red-euphorbia-turns-green/