I got 2 basil plants from a big box store & they are in my windowsill doing well. They are separated by a window frame if that matters. Every morning I wake up & open the curtains, the one on the left has black "seeds" scattered all over the windowsill. The right one does not. I googled basil seed info and I thought that seed only comes from the flower. THERE ARE NO FLOWERS on my plants. I rarely dab in growing fresh herbs, so I figured y'all would probably know in an instant. Are these seeds and how if there are no flowers? THANKS IN ADVANCE FOR ANY HELP!!