I did a job last fall that included planting several 10' Scots Pine trees. A few weeks after I was finished winter came a lot sooner than expected, bringing some harsh temperatures. Last week I went to check on these trees and noticed the tips of all the needles are turning yellow. Is this because they didnt recieve enough moisture in late fall? This week we're also supposed to be getting unseasonably warm weather thats well above the freezing mark, and I was wondering if it would be good to water the trees now, and then make sure I add extra snow around the base of the trees to try and make sure it doesnt freeze? Thanks for any advice.