There are one or two spots in the garden where it’s a struggle to get anything to grow. One such place is behind a brick retaining wall where I suspect the builders back filled with a load of rubble. Somewhere down the line we planted a Euphorbia mellifera there and it has loved it, growing well but not too well, so it remains compact, at least for a few years.
However, it is beside a path and it does grow over it. Not the most pleasant plant to push past, just snap a leaf and it releases milky, sticky and for some, irritant sap. I cut off the worst branches as and when, then about every three years I cut it back hard.
Which I just did. Everything except a few small shoots it produced this year. I would expect a flush of growth from the bottom and will probably be removing the longer shoots before the winter. Next year it will be a neat green dome again, but shorter. Got my view back too.