I have an old flowering dogwood in the backyard that I appreciate every morning with my coffee. It's covered in lichen, but has some great natural branch ramification. I see a bunch of interesting air layer possibilities and have questions. I'm not sure how old the tree, but it's old. Does that matter? Does the lichen affect the air layer? I assume the answer is yes, but can I take air layers from higher up in the tree? Can I air layer some of the 5+ inch diameter branches by simply leaving it on longer? And finally, can I air layer and then lop off the branches or do I need to leave some foliage? There are some branches that are thick and have good movement, but the next branch with foliage is a few feet away.