by Connie Oswald Stofko “I’m pretty excited about this plant,” said Kristin Pochopin, director of Horticulture at the Buffalo and Erie County Botanical Gardens. She was referring to an annual called Cassia didmobotrya, whose unique feature is that when you rub the leaves, it smells like buttered popcorn. The scent is most noticeable in late summer and early fall. Popochin was familiar with this plant when she worked for a wholesale grower in Pennsylvania, but hasn’t seen it much in our area. It’s…