They are caused by either a mutation or a recessive gene. Its estimated to be around 10,000 3-leaf clovers for every 4-leaf. Its also possible that the surrounding environment could play some part in the development of 4-leafs (soil quality, ph, etc.). However, if you find a 4-leaf clover, your chances of finding more in the surrounding area is higher since they may be coming from the same plant or closely related ones that share the gene/mutation.
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