Posted: 21/04/2013 at 11:59
I do not allow,flowers on my coloured or variegated euphorbias to form...I grow for foliage colour.
Many euphorbias become biennial if flowered stems are not cut soon enough....in my opinion. Cut back as soon as flowering is over.
There are so many clones too....some poor plants and better ones of the same variety. Most euphorbias are short lived anyway.
So, I think your euphorbia may be getting past it's best. I take cuttings every year and these root easily to produce good size plants the following year.
I grow euphorbia rubra ..a purple variety....and never allow it to form flowers....they spoil the foliage and weaken it too....in my opinion. I do same with White Swan.
Old leaves and stems do deteriorate, almost suddenly, with age.
I would propagate your plant steve