Forestry applies genetics to trees the same way it does to [[Bee]]s. Vanilla tree saplings need tocan be analyzed with the Field Kit, [[Scanner]] (GT) or Treealyzer, or collected from fertilized leaf blocks with a Grafter or Branch Cutter. Lumberjack villagers also can haveoffer a single trade for a random Forestry sapling of any type, and chests in Forestry village houses canmay have random saplings. Any type of [[Bee]] with the Flower: Flowers trait can pollinate trees inside it's Territory x3 (default Average is 9x9 footprint, six blocks tall, so 27x27x18 for tree pollination.), which will result in Forestry saplings. Butterflies also pollinate and will spawn naturally from Forestry-analyzed trees, but are much slower and less predictable at the job than bees are.
Forestry saplings can be bonemeal force-grown just like their vanilla counterparts. Oak converts to "Apple Oak", Spruce to "Red Spruce" and Birch to "Silver Birch", but other than the name change the tree appearance remains the same.