P.pinea responds a little like P. radiate. It can shoot from bare wood reasonably reliable, at least while young. It also reverts to juvenile growth quite easily which can be preferable to the long, coarse needles of mature foliage. I have some in a grow bed. I've been trying to get rid of them but when I prune low they just keep producing new buds from the bare trunk
May need to resort to glyphosate 
That means you probably don't need to worry quite so much about how old or bare they get before you prune but I would still recommend regular pruning to maintain shoots and/or needles in places you may later want growth - and don't let it get too thick, like mine
if you want to bonsai. We really need some semblance of taper and attractive lines in the trunk if it is to be admired.
yep Pinea it is...just call me fumble fingers. Yes I want nice taper and some movement if possible.Have wired one with a bit of a twist and after cutting it shot well down low...the one in the ground is quite leggy and ordinary so I will chop it off at 1/3rd and see what happens- yes they were a food forest swap but really only room for one here- if that- at full size.
