This only works for Forestry 2.2.8.0 and above.
- Capture a butterfly with a scoops right click. The hit box is on the block beneath the butterfly!
- Put the butterfly in a escritoire and solve the puzzle. I think the higher the complexity of the butterfly, the harder the puzzle is.
- Craft the butterfly with the loot you got from solving the puzzle.
- Throw the "crafted" butterfly in your greenhouse with Forestry trees, it will put an egg on a leaf.
- Harvest the caterpillar from the leaf with again a scoops right click.
- Put the caterpillar on a "clean" leaf and it will hatch as a butterfly some(?) time later.
Don't know if the tree species helps, but my butterfly laid it's egg on on a red spruce. The color of the leaf block was a brighter then normal.
I don't know what exact conditions the butterflies have for laying eggs, but i will keep researching
