According to an online site, I need approximately 64 cups of petals to line my aisle.Unfortuantely, I forgot to order them, and dont want to pay rush shipping fees. Im considering running to the supermarket the night before at just buying roses and twisting them off myself that morning. My question is, how many dozen roses do I need to make 64 cups of petals? And if your a florist, does 64 cups sound right for a 30 foot aisle, just lined with a rose border?TIA!