as to exactly how far I don't thing can ever be determined. Too many variables. winds, tress, or lack of. whether or not the seeds you found were even a result of your male plant(theres more guys growin in the woods than ya think). Id say 1/4 away an some dense forest should be good, once your male starts opening his flowers cut off an area of sacs, put it into a ziplock, go home shower and change, grab a paintbrush and spray bottle of water. open just enough of the bag to get the brush in. get the bristles to collect some pollen brush/dab on area u want to pollenate and spray down the plant shortly after(helps prevent unwanted spread of pollen). go there ONLY to pollenate, don't go grabbing and smelling or watering or anything that could cause inadvertent pollination, go there to pollenate, go home and wash clothes and get rid of your pollen baggy and brush( you don't really have to toss it, but keep it sealed long enough for the pollen to no longer be active)