California,
United States 
my polygala myrtifolia is about five years old, it now has some branches where all the leaves are turning a tingy yellow,
does it need extra nitrogen? or is this an issue of some other sort, if anyone has any ideas on this , please let me know
10 Aug, 2010
Old branches do die away. Just prune back to healthy stems coming up from the base.
10 Aug, 2010