Watermelon Radish Seeds (Aimers International) Heirloom Vegetable. Variety originated in China. Round winter radish to 7.5 cm (3”) in diameter with a pale white cover. Inside flesh is a surprising bright watermelon pink colour. Crisp with a mild flavour that has a hint of sweetness. Perfect for salads, garnishes and pickling too! Matures in 60 days.