Head Cabbage

Cabbage is cut when the head has firmed up — judged by squeezing rather than by looking, since a head can reach full size while still loose inside. The window is bounded at the far end by splitting: a mature head left standing keeps growing internally, and the pressure eventually bursts it open. A split head is unsaleable as fresh produce, so harvest timing is a race against the crop’s own momentum.

Trimming then decides much of the commercial outcome. Leaving wrapper leaves on protects the head in transit and holds moisture; taking them off makes a lighter, cleaner, more presentable unit. Trim level is therefore a negotiated specification rather than a technical constant, and it varies between markets — some buyers want a tight bare ball, others a head with two or three wrappers still attached. Over-trimming for appearance strips away the head’s own packaging, and the cost of that shows up later in the chain.

Cabbage grading centres on firmness and on weight for size — a heavy head for its diameter is a dense, well-filled one, and density is what buyers are really paying for. Beyond that, graders look at head size and uniformity, colour, wrapper condition and trim, freedom from splits, and the absence of decay at the butt and between the leaves. Because the interior of a head cannot be inspected without destroying it, cabbage grading relies more than most commodities on external proxies for what is inside.

• Split and burst heads from over-maturity at cutting
• Loose or puffy heads that are light for their size
• Yellowing and leaf abscission, accelerated by ethylene exposure
• Butt discoloration and decay at the cut stem
• Internal decay and soft rots developing between leaves
• Bruising and abrasion from rough handling
• Frost or freezing injury to outer leaves

Ethylene is worth singling out. Cabbage is non-climacteric and has nothing to ripen, but exposure in store makes it shed leaves and yellow prematurely — a sensitivity, not a ripening response. Stored beside ethylene-producing commodities, cabbage arrives looking tired without anything having gone wrong in the field, so mixed-storage discipline is a genuine quality control for this commodity.

Cabbage is not chilling-sensitive and stores close to freezing at high humidity, and storage types held under controlled atmosphere can be carried for months — remarkable for a leafy vegetable, and entirely a function of the head’s density and its protective wrapper leaves. Field heat is removed after cutting, though the mass of a head makes cooling slower than for an open leafy commodity like lettuce, and the store has to be given time to pull the core temperature down rather than just chilling the surface.

Types diverge sharply here: dense white storage cabbage is a long-store commodity, while Savoy and pointed types are much shorter-lived and traded accordingly. Cabbage ships in cartons, bins, and net bags, and much of the crop leaves the fresh chain entirely — heads delivered for processing into sauerkraut, coleslaw, and other prepared products are handled in bulk as a raw material, with density and internal colour mattering more than the trimmed appearance a retail buyer pays for.