World Placement Rules
BiomesPer ZoneScaleGroup SizeConditions
50.5 to 11Altitude: 0.2 to 1,000; Ocean depth: Up to 2; Terrain tilt: Up to 30; In forest
300.5 to 11Altitude: 0.1 to 1,000; Terrain tilt: Up to 30; In forest
Up to 30.5 to 11Altitude: 0.2 to 1,000; Ocean depth: Up to 2; Terrain tilt: Up to 30; In forest
101 to 1.51Altitude: 0.1 to 1,000; Terrain tilt: Up to 30; In forest

Console commands

Use after enabling developer commands with devcommands.

spawn Birch1 1
spawn Birch1_aut 1
spawn Birch2 1
spawn Birch2_aut 1