The balls get bigger and danglier (is that a word?) and start to look yellowish as the pollen develops - then they split and drop their pollen, at which time it is too late to prevent pollination. The pollen is really good at hitching a ride on fingers, clothes and even minute air currents ... KILL the males early unless you want to collect some pollen, but definitely move them far far away from your ladies.but how can you tell when a male is on the verge of trying to pollinate? Do the sacs open and look noticeably different?