Sand on the top of them? I have a bag of sand but have not used it, what does it do? 6-9 seeds per cup, when do you thin them out? I have 40 one gallon pots with 10 to 18 seeds per pot and in my cups 2 to 6, I mix my seeds per pot or cup so when I plant them, I don't have to keep switching pots and such, I am only growing them for the beauty, I have not got to where yall are on knowing each plant name, and crossing them. Maybe on day, I will start a new bed, and get all high text like yall are.