White Icicle Radish Seeds Heirloom Vegetable.  A handsome long radish with glistening, pure white roots up to 12.5 cm (5″) long and nearly 2.5 cm (1″) in diameter. Flesh is crisp and sweet with a mild flavour that warms the tongue but tends to be less pungent than round varieties. This is an attractive variety for both commercial growers and home gardeners.