Hostas are grown primarily for their dramatic foliage which may be oval, lance-shaped, rounded, or heart-shaped. Dense mounds of overlapping leaves radiate from center of clump in a variety of colors and variegation. Colors range in shades of green, grey, blue, and yellow. Leaves may be glossy, dull, smooth, quilted, puckered, or wavy. Thin spikes of pale trumpet-shaped flowers appear in summer. Generally shade tolerant, hostas grow best in enriched soil with regular feeding. 'Blue Angel' makes a very large tiered mound of heavily textured blue leaves that can be as wide as 18 inches in diameter.