I love Biomes O' Plenty. In a new world, I found myself in a snowy biome with huge Fir trees. So much wood! My question is whether its possible to grow the large 3x3 Fir trees? I've tried planting saplings in various shapes, but they always grow with a one-block trunk. There are other large trees as well, like large 2x2 Oak trees, that grow in other biomes. Is there any way to grow these large trees?