Growing cabbage is a rewarding experience for any gardener. Many people believe you need a large backyard plot to harvest these leafy globes. This is not the case. You can grow beautiful, crunchy cabbage right on your balcony, patio, or porch. Container gardening allows you to control the soil quality and move the plant to find the best sunlight. This guide will provide everything you need to know about growing cabbage in a pot.
Selecting the Right Cabbage Variety
Not all cabbages are the same size. Some varieties grow quite large and require significant space. When growing in pots, it is best to choose “dwarf” or “small-head” varieties. These types are bred to produce compact heads that fit perfectly in containers.
Good choices for containers include:
- Baby Choi: A small variety that matures quickly.
- Gonzales: Known for producing small, four-inch heads.
- Red Express: A compact red cabbage that fits well in tight spaces.
- Savoy Express: A crinkly-leaved variety that stays small.
Choosing the Perfect Container
The container is the home for your cabbage for several months. Cabbage has a relatively shallow but wide root system. You need a pot that is at least 12 inches deep and 12 inches wide. A five-gallon bucket is often the perfect size for a single large cabbage head.
Ensure your pot has plenty of drainage holes. Cabbage likes moisture, but it cannot sit in soggy soil. If water cannot escape, the roots will rot. If you are using plastic pots, you can easily drill extra holes in the bottom if necessary. Terracotta pots are also excellent because they allow the soil to breathe, though they dry out faster than plastic.
The Best Soil Mix for Cabbage
Do not use garden soil in your pots. Garden soil is too heavy and may contain pests or diseases. Instead, use a high-quality potting mix. A good mix should be light, fluffy, and rich in organic matter.
Cabbage is a “heavy feeder.” This means it needs a lot of nutrients to grow those thick, dense leaves. Before planting, mix in a handful of compost or a slow-release organic fertilizer. Look for a fertilizer that is balanced or slightly higher in nitrogen to encourage leafy growth.
Planting Your Cabbage
You can start cabbage from seeds or buy seedlings from a nursery. If starting from seeds, sow them indoors about six to eight weeks before the last frost. If you are planting in the fall, sow them in late summer.
- Fill your container with potting mix, leaving about an inch of space at the top.
- Make a small hole in the center.
- Place the seedling in the hole. Plant it slightly deeper than it was in its original tray.
- Firm the soil gently around the stem.
- Water the plant thoroughly immediately after planting.
Light and Temperature Requirements
Cabbage is a cool-weather crop. It grows best when temperatures are between 45°F and 75°F. If the weather gets too hot, the cabbage may “bolt,” which means it grows a flower stalk and becomes bitter.
Your cabbage needs at least six to eight hours of direct sunlight every day. In very hot climates, you might need to provide some afternoon shade. Since your cabbage is in a pot, you have the advantage of moving it to a cooler spot if a heatwave hits.
Watering and Feeding
Consistent moisture is the secret to a great cabbage harvest. The soil should feel like a wrung-out sponge. If the soil dries out completely and then gets soaked, the cabbage head might split open. Check the soil daily by sticking your finger an inch deep. If it feels dry, it is time to water.
Because you are watering frequently, nutrients will wash out of the pot. Feed your cabbage with a liquid seaweed or fish emulsion fertilizer every two weeks. This provides a steady stream of nutrients to keep the leaves green and strong.
Managing Pests and Diseases
Cabbage attracts a few specific pests. The most common is the cabbage worm. These are small green caterpillars that blend in with the leaves. They eat large holes in the foliage. You can pick them off by hand or use an organic spray like Bacillus thuringiensis (Bt).
Aphids are another common issue. These tiny insects cluster on the underside of leaves. You can usually blast them off with a strong stream of water from a hose. If the problem persists, use an organic insecticidal soap.
Harvesting Your Cabbage
Harvesting time depends on the variety you planted. Most small-head varieties are ready in 60 to 80 days. You will know it is ready when the head feels firm and solid to the touch. If the head feels soft or loose, it needs more time.
To harvest, use a sharp knife to cut the head at the base, just above the outer leaves. You can leave the wide outer leaves in the pot or compost them. Sometimes, if the weather remains cool, the remaining stem will grow small “mini-cabbages” after the main head is removed.
Frequently Asked Questions
Can I grow more than one cabbage in a single pot?
It depends on the size of the pot. In a standard 12-inch pot, you should only grow one cabbage. If you have a large trough or a whiskey barrel, you can space them about 10 to 12 inches apart. Crowding them will result in small, stunted heads.
Why is my cabbage head splitting?
Splitting usually happens because of irregular watering. If a cabbage stays dry for too long and then receives a massive amount of water, it grows too fast for the outer leaves to keep up. Keep the soil consistently moist to prevent this.
My cabbage isn’t forming a head. What is wrong?
This is often caused by heat. If temperatures stay consistently above 80°F, the plant may focus on leaf growth rather than head formation. Excessive nitrogen fertilizer can also cause the plant to produce lots of loose leaves instead of a tight head.
Do I need to prune the outer leaves?
No, you should leave the large outer leaves alone. These leaves act as solar panels, gathering energy from the sun to build the head. Only remove leaves if they are diseased, dead, or severely damaged by pests.
Can I grow cabbage indoors?
It is difficult but possible. Cabbage needs a lot of light and very cool temperatures. Most homes are too warm and dark for cabbage to thrive. You would need high-intensity grow lights and a very cool room to be successful. Growing outdoors in a pot is much easier.