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I have a crimson maple tree in my backyard, medium sized, probably as big as it's going to get. A few years ago it was doing really bad and I thought it was going to have to come down. However, I am seeing a lot of new growth and branches on it now and it is budding fairly well this year. I went up in the tree a week ago and trimmed the dead branches. I found two large holes (where branches fell off) that got rotted and are now fairly deep and water just sits in there. One of these is a main branch from the trunk. I drilled a hole out the bottom to let any water drain and let it air out. Yesterday I filled the holes with minimal expanding foam so water won't continue to get in there and rot it out. I have no idea if this was a good or bad move but figured it wouldn't hurt. Should I do anything further? I read on the can that the foam is only water resistant, not sure why though. Thanks for any advice.
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