A quick glance at Peggy Martin’s Gonzales, Louisiana, home, and it’s clear she loves plants. Paintings and prints of flowers line her walls, tablecloths pop with colorful flora, potted plants fill corners and bouquets dot shelves and end tables. Her yard is an oasis of greens, pinks, reds and purples.
Growing along her garden gate is an extraordinary plant with a storied past, a prolific blooming v…