Of course you can grow just one plant, but yield will be limited to that plant. Too many people think you can grow several plants to produce higher yield...partly true. But too many plants in an area will stunt the yield. You have to find a happy medium. One plant that is controlled, will yield more than 4 plants in the same area. Read FAQ's to see about increasing yield. Your odds of it being male is about....um let's see.....50% is my best guess. Unless, like 2cimdma said, you have feminized seeds. Then your odds are less than 5% it will be male, unless as was said also, it goes Hermi on you from such things as stress. The first thing I would do is get more light for later on in flower stage, making sure it's red spectrum (for flowering), blue spec is for veg stage. Slow grow could be caused by several reasons including low or high temperatures, low or high nute levels. Get as many meters for different readings as you can so you can learn from your first grow to make the next and the next etc. grows more potent and larger yields. The more $$$ you invest, the better all will be. But you don't need to invest a lot of cash to do well. My total investment is under $200. Not even the cost of half-assed weed on the streets. Good luck.
