Places grown Oak and Birch trees, and applies bonemeal in a 7x7 (circular) area. Augmenting with a source gem will increase the radius by 1 for each gem. Augmenting with a Brown Mushroom will convert the area to Podzol and spawn taiga resources. Augmenting with Glow Berries will spawn jungle resources.
Reminder: This is just the default recipe, modpacks can and will adjust recipes.