peony - should I divide? transplant? both? when?
3 or 4 years ago I planted "Monsieur Jules Elie", a gorgeous herbaceous peony. Its now really too big for the area I planted it in, and I'd like to divide it and move it. Its still got a lot of vigorous green foliage, and the place I'd like to move it is still covered with blooming annuals. I know that September is supposed to be the time to divide - but really how late can I wait to transplant? Or should I hold them over the winter in peat, like canna?