For the other side of the stream I could also see in my mind's eye what I wanted. I envisaged a row of copper beech pillars. So five beech twigs (they were barely saplings) were purchased as, quite frankly, I could only afford to buy small.
The years go by and two of the twiglets very promptly die. I replace them and they die again and so I decide that three is probably a good number anyway.