Hello, I planted 4 Hydrangea quercifolia 2 years ago on the north west side of my East Vancouver home. One of them, planted in the midst of the others, is flagging this year. The others seem fine. I don't see pests on the leaves, but it's definitely in decline. Any ideas what the trouble could be and what to do about it? The oxalis I thought I'd try out is going mad - that's the smaller plant in the background of the photos. Thanks!
Soil is probably too damp and airless, may also have come already infected with water molds from the dealer.
