When a Minnesota man revisited a Christmas tree farm he once frequented with his late wife in the past, understandably, his thoughts turned to her. But he couldn’t have anticipated getting a remarkable surprise that day: the tree he chose turned out to have a heart-shaped trunk, which turned into a heartfelt keepsake. Mark Schommer is convinced that the tree was a sign from his late wife, Patti, who was lost to Alzheimer’s in September. “One of those things, you wish you had more time, more time to spend,” Mark told NBC. Married for 41 years, it had been Mark and Patti’s tradition to visit Goldenman Christmas Trees in Zimmerman each year. There, they searched for the perfect tree together. Mark is known for being very particular about finding the perfect tree. “Married in ’79, finally had our first baby in ’83, but that’s when we started going to Goldenman …