Don't sweat the males too much, they really do take some time to develop flowers, in spite of what J.C. says (sometimes I wonder if he has any experience at all, the stuff I hear). They're not going to just jump up and drop clouds of pollin in the space of a couple hours, believe me. In fact, they have to 'turn down' first. That's where the flower develops to the point where it points downwards. A few hours later, or the next day, the flower opens. It still doesn't drop right away. The freshly opened flower will take about an hour 'till it's ready to pour pollin. At that point, the pollin is still a little wet and will fall straight down into your collecting tool. That's the best time to collect it, later on it's lighter and can blow around easier. If you plan to store it, make sure you dry it some first. A package of silica gel in a small jar works well.