We Get Questions About Euphorbia Trigona Spots
Please take a look at my Euphorbia trigona and give me an advise.
I am concern with spots, overall unhealthy look, slow growth and size of a current planter.
Your Euphorbia is under-potted, and is showing signs of what look to me like both frost damage and possibly some sunburn. Overall the plant looks pretty good, but repotting to a bigger terra cotta pot and out of the plastic around the end of March, but not before, should help. Also, we recommend having it indoor in the winter, and out of full sun.
Let us know if you have any other questions