When does a plant usally start showing sex?

Hi @belikewaterh20! A regular strain (photosynthesis) will start showing its gender after 4 to 6 weeks in the vegetative stage. It won't be bud-sites yet (if female) but you shall see a few pistils (or pollen sacs), enough to know the sex and make a decision based on that gender. In case of an autoflowering strain, the gender shows up after 3 to 5 weeks, when the plant starts its pre-flowering process. There are some methods to determine plant's gender without waiting X weeks or without switching to 12/12 light cycle: just put a cardboard onto one of your stems, so the branch remains hidden from any source of light, and this stem will start flowering before the rest of your plant. One other option would be to take some clones, root them, and put them under a 12/12 cycle (even a tiny lamp shall work). Hope this will help, keep up the great work on these babies and happy growing! 👊