Talk:Fart dragon/@comment-86.131.16.40-20120322224951/@comment-4775325-20120324131834

They really don't have an effect, you can and do get Tree or Moss with both Plant + Earth or Earth + Plant and there was no proof whatsoever that a level 10 dragon had any greater chance of breeding a Leap Year dragon. Most people breed with level 10 or higher dragons just because after you get to a certain stage of the game it's so cheap to feed a dragon to level 10 that people don't bother leaving any dragons at levels lower than 10. On the external forum of this wiki a few people have been doing testing on the issue (50 tests for each of various combinations of levels and orderings) and whatever the level or order on average there was little to no difference in the results.