Just press the flag for some random terrain. :) 1/30 chance for tree to spawn on a tile, 1/30 chance for sunflower to spawn on a tile, 1/15 chance for red flower to spawn on a tile. 26/30 chance for just grass to spawn
The sunflowers and trees were hard to do because they took up 2 tiles, and for some reason, in the list, I could not override the upper portion with the top part of the plant. So I just stamped the top part over what was already there. I could do some advanced stuff with this!