hello, we are planting over 30 fat albert blue spruce along the edge of our property. they are approx. 5' tall each. They will be planted in early november when they arrive. My question is, I hear about many critters to watch for while growing these trees, aphids, etc. Does anyone have any advice on preventative maintenance for this type of tree, what to watch for, how to control/stop it before it happens etc..?