Central as in east of Snoqualmie? Beautiful area. All I can say is many plants have died this past year or so for no discernable reasons, sometimes our sun contributes to the demise, othertimes the earth does the same, do try new soil, or layering new parts of the plant, let me see. Needs high acidity, can be expected to live 20 years (it may be older than you think) can not tolerate standing water...