Question
My Don Juan has several branches. Some are green but do not look as strong as the newer shoots.  The newer ones are getting long enough to bend an tie out along the fence. I am wondering if I should prune the weaker looking ones and just keep the stronger ones.

Answer
There are two types of new growth. One is the main canes that come from the base and these are the ones that will be the strongest and the longest. Those are the ones you try to bend  or tie onto a trellis or an arch. The others are what are called laterals and they will grow from these long ones. This is where the flowers will come from. If your weaker ones are laterals, then just let them grow, if they are coming from the base I would also let them grow and here is the reason why. Don Juan does not make a lot of canes from the base so no matter whether they are thick or thin, I would keep them as that may be all you ever get. The general rule for a climber in regards to pruning, is to just let it grow for about three years and then if it outgrows it allotted space, you can then trim it back.