if you don't get them all, they could open and release pollen that could potentially seed your crop. if you want to be extra careful, remove the herming plants. i am having this issue with some alien bubba's that i'm running....don't want to ax em because it's not worth running my light for 2 plants...i check both my herming plants daily for male organs and pull em when i find em. that way, at least i have some fire to smoke at the end. if you choose to keep em, be very thorough in looking over your plants for nanner's.