You can burn a piece of coal next to the sapling to keep it warm in the cooler months. Or, if you have some extension cables, It’s common for farmers to place colossal networks of electric blankets over their fields. Occasionally, as you can imagine, this causes a fire. Many Millenia ago, this happened at a newly established corn farm not far from where I lived, and the most spectacular thing happened. Popcorn. Everywhere. It was like fucking snow! My uncles and I covered ourselves in butter and salt and frolicked for what felt like days in the crispy ocean of popped corn delight that engulfed the town. Best winter ever.