Yes sir I do. I don't remember exact years, but the ones I put in 4-5 years ago have basically just the trunk left. My thinking is that adding 30+ each year will keep the right amount of dense cover in the pond. And I do find the occasional Christmas ornament here and there around the pond
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One of my local Home Depot stores piles all the unsold trees in the parking lot right after Christmas. They're also a recycling point for the town. I normally stop in twice and get as many as I can put in the pickup. You'd be surprised how many you can get if you pack them in.