male or female?

Hey guys ...i got a fairly simple question i think however i realy havn't found a clear answer. I have 10 seeds that i sprouted of Sour D and i want to know, at what stage can i determine the sex...i always thought they show sex in flower only. is this true...i dont wanna have to grow all the plants and at the end throw half away...please help

no u dont have to put the whole plant into the flower cycle. u can take a clone from each one and put that into flower and in about a week or so depending on the strain u will be able to see if it has pollen sacs or pistils