I’m of the opinion that every vine is probably going to be a decision - at least it was for me.
The local experts told me that you cut back to where the vine is the size of a number two pencil - or, since you probably don’t want to carry a pencil around, the size of the last joint of your little finger. If that leads you to the point of only having two or three buds left, then cut there.
You are likely to end up with very uneven vines this year - which is perfectly fine. For the vines that are shorter than your knee, put the grow tube back on and let it have a little extra heat and protection.
The local experts told me that you cut back to where the vine is the size of a number two pencil - or, since you probably don’t want to carry a pencil around, the size of the last joint of your little finger. If that leads you to the point of only having two or three buds left, then cut there.
You are likely to end up with very uneven vines this year - which is perfectly fine. For the vines that are shorter than your knee, put the grow tube back on and let it have a little extra heat and protection.