A low-growing perennial that forms fans of rich golden-yellow, grasslike tufts, 'Ogon' makes an excellent container subject or small-scale groundcover. In shady areas usually dominated by different shades of green, the golden foliage adds a delightful twist. This sweet flag from Japan has tilted fans of gold foliage. The flowers are inconspicuous. Best grown in evenly moist soil and even as a marginal plant in ponds.