How to Grow Cabbage

Cabbage is a cool-season brassica that produces dense, tightly wrapped heads of leaves in a rainbow of colors — from pale green to deep purple and savoy types with crinkled, textured leaves. It needs cool temperatures (45–75°F) for head formation and bolts in summer heat. Like most brassicas, cabbage is most often planted for either a spring harvest (before summer) or a fall harvest (after summer heat breaks).

Cabbage is one of the most calorie-dense, nutrient-rich vegetables you can grow per square foot, and heads store well in a root cellar or refrigerator for months. Modern varieties range from small 2-lb salad cabbages ready in 60 days to large 10-lb storage cabbages that require 120 days. Choose varieties appropriate to your season length and storage goals.

Growing Tips

Cut the outer stalk in an X pattern after harvesting the main head — the plant will often produce 3–4 smaller secondary heads that are excellent for coleslaw or cooking. This doubles the value of each plant space.
Prevent cabbage head splitting by slicing partway through the roots on one side of each plant with a spade when heads approach maturity. This slows water uptake and reduces splitting from heavy rain or sudden moisture influx after a dry period.
Use slug bait or copper tape around cabbage transplants, especially in wet climates. Slugs are a major cabbage pest and do most of their damage at night. Beer traps (shallow containers sunk to soil level and filled with cheap beer) effectively trap and eliminate slugs.
Rotate cabbage (and all brassicas) to a different bed every year on a minimum 3-year rotation. Brassica diseases including clubroot (a devastating soil-borne disease that distorts roots) build up rapidly in soil where brassicas grow repeatedly.
Lime your soil before planting cabbage if pH is below 6.5. Clubroot fungus thrives in acidic soil; maintaining pH 6.5–7.0 significantly reduces infection risk. Most vegetable garden soils benefit from lime every 2–3 years.

Companion Planting

Cabbage benefits from planting in diverse mixed beds rather than monoculture rows — diversity reduces localized concentration of cabbage moth and aphids. Strict 3-year rotation away from brassica-family crops is the most effective long-term disease prevention. The planner tracks your rotation so you never plant brassicas in the wrong bed.

FAQ

When should I plant cabbage?

Transplant cabbage seedlings 3–4 weeks before your last expected spring frost for a summer harvest, or start seeds in June and transplant 10–12 weeks before your first fall frost for a fall harvest. Cabbage is highly frost-tolerant once established, handling temperatures down to 28°F. Fall planting is often preferred because cooling temperatures align with head development.

Why did my cabbage split open?

Cabbage heads split when the plant absorbs water rapidly after a period of drought, causing the inner head to expand faster than the outer wrapper leaves can stretch. To prevent splitting, water consistently throughout the season, and use the root-cutting technique (cut halfway through the root ball on one side with a spade) as heads approach maturity to slow water uptake.

How do I know when cabbage is ready to harvest?

Cabbage heads are ready when they feel firm (like a softball or bowling ball when squeezed) and have reached their expected size for the variety. Don't rely on size alone — feel the firmness. Immature heads feel spongy; mature heads are rock-solid. Harvest before temperatures exceed 80°F in spring, or after several frosts in fall, as heads may split in sustained heat.

What are the white butterflies around my cabbage?

Those are imported cabbageworms in their adult moth stage — the small white butterflies that flutter around brassica beds lay eggs that become the green caterpillars that devour cabbage leaves. Apply Bt (Bacillus thuringiensis) spray to control caterpillars, or use floating row cover at planting time to exclude moths entirely before they can lay eggs.

Can I store cabbage heads?

Yes — cabbage stores exceptionally well. In a root cellar or refrigerator kept at 32–40°F with high humidity, whole heads keep 3–5 months. Remove outer leaves, leave the stem intact, and store in a single layer. In traditional root cellars, wrap heads in newspaper and check monthly, removing any that show soft spots. Savoy-type cabbages have shorter storage life than smooth-headed storage varieties.