I have just heavily cut back a massive laurel which was cramming itself into a raised bed, and found in the middle of it a single stalk (maybe 7 feet long?). About a foot from the end, and presumably where cut back as part of previous laurel trimming, there are quite healthy looking small branches, which are trying to bud.
The majority of the stalk has been so starved of light that it is almost white, and now it isn't leaning on the laurel cannot support itself. I have tied it to a temporary post to see if it manages to flower.
Obviously it is going to need to be cut right back, but there is only this one stem from the root, and there are no obvious growth points anywhere except right at the top. What height should I cut this one stem down to?