Cabbage in Zone 5B — Mid-Atlantic

Cabbage is a fantastic addition to any Mid-Atlantic garden. The satisfying crunch and slightly sweet flavor are delicious raw in slaws or cooked in hearty fall dishes. Here in Zone 5B, its versatility shines in our four seasons. You can harvest fresh cabbage from late spring into early fall.

Our humid summers and variable spring weather can pose challenges, but with proper timing, you can easily enjoy a bountiful cabbage harvest. Our 178-day growing season gives you plenty of time to bring these beauties to maturity.

Starting cabbage indoors gives you a head start, especially with our moderate spring. Begin your seeds indoors from mid-February through early March, about six weeks before you plan to transplant them outside. Use seed trays and a good seed-starting mix.

Keep the soil consistently moist but not soggy. Bottom watering is a great way to ensure even moisture without disturbing the delicate seedlings. Provide plenty of light and warmth for optimal germination.

Transplant your cabbage seedlings outdoors from early April through early May. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them acclimate to the fluctuating temperatures and wind.

Space your plants 12-18 inches apart in a sunny spot with well-drained soil. Be prepared to cover the young plants if we get an unexpected late frost, which can happen in the Mid-Atlantic.

Cabbage needs consistent moisture to thrive, especially during our humid summers. Aim for about 1 inch of water per week, either from rainfall or irrigation. The "finger test" is your friend: stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water.

Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our humid climate. Overwatering can lead to root rot, while inconsistent watering can cause the heads to split. If we have a dry spell followed by heavy rain, watch out for splitting.

Mulching around your cabbage plants with straw or shredded leaves helps retain moisture and suppress weeds, but be sure the mulch doesn't stay too wet against the stem.

You can expect your first cabbage harvest from mid-June through early August, about 70 days after transplanting. The key is to feel the head: it should be firm and solid when squeezed. Also, make sure it has reached the full size expected for the variety you planted.

Use a sharp knife to cut the head at its base. Leave the outer leaves intact; sometimes, smaller heads will form from the stem.

As our first frost approaches in mid-October, harvest any remaining mature heads. Even if they're not quite as large as you hoped, they'll still be delicious.

Here are some common problems you might encounter growing cabbage in the Mid-Atlantic:

Cabbage Worms

• What it looks like: Smooth green caterpillars chewing irregular holes in leaves, leaving dark green droppings behind. You'll often see white butterflies fluttering around your plants.
• What causes it: These are the larvae of those cute white cabbage butterflies. They can have multiple generations per season, especially in warmer years.
• How to fix/prevent it: Bt spray is very effective at controlling cabbage worms. Floating row covers are a great preventative measure, keeping the butterflies from laying eggs on your plants. Handpicking caterpillars is also effective, and interplanting with aromatic herbs like thyme and sage can help deter them.

Cabbage Loopers

• What it looks like: Similar to cabbage worms, but these caterpillars move with a distinctive "looping" motion. They also chew holes in leaves.
• What causes it: Cabbage loopers are another type of caterpillar that feeds on brassicas.
• How to fix/prevent it: Bt spray works well on cabbage loopers too. You can also use floating row covers and handpick them.

Splitting

• What it looks like: The cabbage head cracks open.
• What causes it: Inconsistent watering, especially after a dry spell. The cabbage head grows too quickly when it suddenly gets a lot of water.
• How to fix/prevent it: Maintain consistent soil moisture. Water deeply but less frequently, rather than shallow watering every day. Mulching helps retain moisture.

Clubroot

• What it looks like: Stunted growth, wilting in the afternoon heat, and yellowing leaves. When you dig up the plant, the roots are swollen, distorted, and club-shaped.
• What causes it: A soil-borne pathogen (Plasmodiophora brassicae) that can persist in the soil for 10+ years. It thrives in acidic, wet soil.
• How to fix/prevent it: Raise the soil pH to 7.0-7.2 with lime. Improve drainage. Rotate brassicas on a 7-year cycle. Remove and destroy infected plants (don't compost them). Start transplants in sterile mix.

Mid-Atlantic Specific Challenges: Our moderate-to-hot heat and humid climate can encourage pests and diseases. Consistent monitoring and preventative measures are key to a successful cabbage harvest.

Companion planting can give your cabbage a boost. Green beans are good companions because they fix nitrogen in the soil, which cabbage needs. Celery helps deter cabbage white butterflies. Onions and dill can also repel pests. Potatoes don't directly benefit cabbage, but they don't compete for nutrients, either.

Avoid planting cabbage near tomatoes, strawberries, or peppers. These plants can attract similar pests and diseases, increasing the risk of problems in your garden.