Make sure you screen them from Mice with tubing or 1/4" mesh - for at least 2-3 ft up the trunk. After this years' deep snows - I'm going to loses some apples after 3 years - and pines after 5 years because of Mice - It makes me furious!
You can see that I put trunk protection on - but only for 12"-18" on most trees. - Don't make my mistake.
FH