I am off Shamrock hunting 
Remember, 78% of all statistics are made up. So even though they say there is only one 4-leafer in 10,000 clovers, thats not entirely the whole story. One clover is just a member of one White Clover plant, which can cover from a few square inches to a few square feet. And some plants are more susceptible to mutation than others, so if you find one, look hard in the near vicinity.
Link: Full Guide
