Hosta ‘Sum & Substance’ is a widely grown cultivar valued for its impressive scale and bold foliage. This deciduous, clump-forming perennial and its large, glossy, chartreuse-to-gold leaves thicken and intensify in colour with increased sunlight, and it produces tall scapes of pale lavender flowers in mid to late summer. ‘Sum & Substance’ is commonly used as a dramatic specimen plant, for bold-textured foliage contrast in woodland or shade gardens, and in large containers or mass plantings.