We live in southern Alberta, south of Lethbridge. We have a 5 acre farmyard that had multiple gorgeous Blue Spruce trees that were well maintained for 20 years. The trees were thick, lush, and magnificent.
About 5 years ago we suffered a flood in our farmyard and the water did not recede fully for a week or two and even then the soil was saturated for a good period of time. By the next spring our trees had lost half of their needles and were in sad shape. It is five years later and they survived and have recovered somewhat but are not the thick beautiful trees they once were.
Is there any pruning method or other remedy we could attempt to help the trees restore to their former thickness?