depends, ive seen them get to about 4-5ft with the foliage and then they can put out a flower spike to maybe 6ft or so, so good to cover some smaller bushes but nothing too big
I was just a boy delivering newspapers and I noticed a pair in two planters at the end of the sidewalk up to the house. As soon as I tried to move a leaf I thought I had been stung... I think those plants have thorns on the bottoms of their leaves to fuck with stoners