Green-and-cream leaves and season-long bright yellow flowers make Variegated Yellow Loosestrife (Lysimachia punctata 'Alexander') a superb accent plant in any garden. Introduced in 1990, it's slower-growing than most loosestrife and produces a clump 2 feet tall by 2 feet wide. Many gardeners consider it worth growing for its foliage alone. A new variety, 'Golden Alexander', has the same yellow flowers but green-and-cream-yellow leaves.