A cabbage generally weighs between 500 to 1,000 grams 1 to 2 lb.
Crop Production Science in Horticulture.
According to Pliny, the Pompeii cabbage, which could not stand cold, is "taller, and has a thick stock near the root, but grows thicker between the leaves, these being scantier and narrower, but their tenderness is a valuable quality".
Acta Universitatis Agriculturae Sueciae.