Snack Lettuce Crunchita This variety is a cross between iceberg and Romaine type lettuce. Romaine lettuce gave the variety its appearance and iceberg - color, juiciness and crispy leaves. Variety is resistant to powdery mildew, internal necrosis. Grown outdoors, under cover or in hydroponics. The soil for lettuce should be loose, fertile, moist and non-acidic (pH 6,0-6,8). When the soil is too acidic, lettuce grows poorly, their heads become smaller and the leaves turn yellow.