By the scent of marigolds, I gather you mean the scent of the bruised foliage. Some plant scents such as this I describe as pungent. (Just checked the meaning and believe it DOES fit. Actually one of the meanings is "mentally stimulating or appealing as in pungent wit.) The scent of marigold, geranium, chrysanthemum and lantana all fall into a special category. They all remind me of the scent of my dad returning from a day in the greenhouses...a vivid emotional memory carried by the distinctive fragrance. Tomato greens have a similar type of scent. The Dahlberg Daisy is another...such an overlooked beauty!