How to Grow Cabbage From Seedling to Harvest
Cabbage is one of the most useful crops in a vegetable garden. It is productive, stores well and can be eaten fresh, cooked, fermented or added to almost any meal. But it is also a crop that rewards patience. Cabbage takes time to grow, and how you handle it in the early stages has a direct effect on how well it forms a head later.
At our garden in Soshanguve, we grew a crop of cabbages alongside our other vegetables and fed them with chicken feather fertilizer. The results were strong, and the harvest was one of the most satisfying so far.
This article walks through the full journey, from planting the seedlings and feeding them, to watching them form heads, to harvesting them at the right time. If you want to see how we prepared the fertilizer that fed this crop, I covered that in how to use chicken feather fertilizer in a vegetable garden.
In This Article
- Why cabbage is worth growing
- Planting the seedlings with feather fertilizer
- Spacing and early care
- Watering and feeding during growth
- Head formation
- When cabbage is ready to harvest
- How to harvest cabbage without damaging the plant
- What a good harvest looks like
- What I learned from growing cabbage
Why Cabbage Is Worth Growing
Cabbage is a cool-season crop that grows well in most South African gardens. It prefers steady moisture, good soil and moderate temperatures. In our climate, cabbage grows best in autumn and winter, when the days are cooler and the plants are not stressed by intense heat.
The main reason cabbage is worth growing is that it stores well. A mature head can stay fresh for weeks if kept in a cool, dark place. That makes it a reliable crop to have on hand, especially during a season when other vegetables are slowing down.
Cabbage is also a heavy feeder. It needs plenty of nitrogen and consistent moisture to form dense, healthy heads. This is one of the reasons we fed our cabbage with feather fertilizer, which releases nitrogen slowly over the season and matches the way cabbage grows.
Planting the Seedlings With Feather Fertilizer
We started our cabbage crop from seedlings. When the seedlings were ready to go into the ground, we planted them into prepared soil and applied chicken feather fertilizer around each one.
The feather fertilizer was placed in a small ring around the base of each seedling. We kept it a few centimetres away from the stem so the material would not sit directly against the plant. The fertilizer works through the soil, so it does not need to touch the stem to be effective.
Because feather fertilizer breaks down slowly, the cabbage seedlings had a steady supply of nitrogen from the very beginning. This is exactly what cabbage needs in the early stages, when the plant is building its leaf mass.
Spacing and Early Care
Cabbage needs space. Crowded plants compete for light, nutrients and airflow, and they are more likely to develop pest and disease problems. For a healthy head, space each cabbage plant around 45 to 60cm apart.
In our garden, we spaced the seedlings generously and kept the rows about 60cm apart. This gave each plant room to spread its outer leaves without touching the neighbouring plants.
After planting, we watered each seedling gently at the base. The first few days are important. During this time, the plant is settling into its new position. Keep the soil moist but not soaked.
We also kept the beds mulched. The mulch layer helped hold moisture in the soil, kept the surface cool and reduced the number of weeds that competed with the young cabbages.
Watering and Feeding During Growth
Cabbage is a thirsty crop. It grows best when the soil stays consistently moist. Long dry spells followed by heavy watering can cause the heads to split or grow unevenly.
We watered our cabbage beds deeply and regularly, checking the soil with a finger before each watering. If the top few centimetres of soil were dry, we watered. If they were still moist, we waited.
For feeding, we relied mainly on the feather fertilizer that was applied at planting. Because the fertilizer releases nitrogen slowly, the cabbage had a steady supply without the risk of overfeeding. We also used a light liquid feed during the early weeks to give the plants a quick boost after transplanting.
The combination of slow-release fertilizer and light liquid feeds kept the cabbage growing steadily through the season.
Head Formation
Around 8 to 12 weeks after transplanting, the cabbage plants start to form their heads. You can see the central leaves begin to cup inward and tighten together.
This is the most sensitive stage of cabbage growth. The plant is putting most of its energy into forming the head, and any stress during this period can affect the final quality.
During head formation, keep watering consistent. Do not let the soil dry out, but also do not flood the bed. Split heads are common when the plant has been through a dry spell and then gets a heavy soaking.
Continue feeding lightly if the leaves start to pale. A light liquid feed every two weeks is usually enough. Too much nitrogen at this stage can cause the plant to produce loose, leafy heads instead of tight ones.
Watch for pests during this stage too. Cabbage worms, aphids and slugs all target cabbage, especially when the head is still forming.
When Cabbage Is Ready to Harvest
Cabbage is ready to harvest when the head is firm and fully formed.
To check, press the head gently with your hand. A mature cabbage head feels solid and heavy. If the head still feels loose or soft, give it another week or two.
Another sign that cabbage is ready is the outer leaves. As the head matures, the outer leaves start to fold outward and the head pushes up slightly. Some of the outer leaves may begin to yellow or dry at the edges, which is a normal part of the plant finishing its growth.
The size of the head depends on the variety and the growing conditions. Some cabbages form small, tight heads. Others grow larger. What matters is the firmness of the head, not just the size.
Do not wait too long to harvest. If the head is left on the plant after it is fully mature, it can start to split. Split heads are still edible, but they do not store as well and they lose some of their quality.
How to Harvest Cabbage
Harvesting cabbage is simple, but a clean cut makes a difference.
The best tool for harvesting cabbage is a sharp pair of pruning shears, secateurs or a strong knife. You want a tool that will cut cleanly through the thick stem without crushing or tearing it.
To harvest:
- Hold the head steady with one hand.
- Position the shears near the base of the stem, just above the soil line.
- Cut cleanly through the stem in one motion.
- Lift the head away from the plant.
Leave the outer leaves on the head. These protect the inner leaves and help the cabbage store longer. Only remove them when you are ready to use the cabbage.
The cut stem stays in the ground. In some cases, the plant will send up small side shoots from the base, which can produce small secondary heads. These are usually smaller and looser than the main head, but they are still edible.
What a Good Harvest Looks Like
A good cabbage harvest is easy to recognise. The head is firm, heavy and tightly packed. The outer leaves are still attached and show a healthy green colour. There are no signs of rot, pests or disease.
When you cut the stem, it should be pale and clean, not brown or mushy. The cut surface should look fresh.
Freshly harvested cabbage is at its best in the first few days. If you are not using it right away, keep it cool and dry. A mature head with its outer leaves still attached can stay fresh for several weeks in a cool, dark space.
What I Learned From Growing Cabbage
Growing cabbage taught me that patience and steady feeding matter more than anything else. The plants respond to consistent care.
The main lessons from this crop:
-
Slow-release fertilizer suits cabbage well.
Feather fertilizer gave the crop a steady supply of nitrogen through the season, matching the plant's natural growth rhythm. -
Consistent watering prevents split heads.
Cabbage reacts badly to dry spells followed by heavy watering. Keep the soil evenly moist. -
Spacing matters.
Crowded cabbage plants compete for everything and produce poor heads. Give them room. -
Head formation is the sensitive stage.
Once the head starts to form, avoid stressing the plant. Water steadily, feed lightly and watch for pests. -
Do not wait too long to harvest.
A fully mature head can start to split. Harvest as soon as the head feels firm. -
A clean cut matters.
Sharp shears give a clean cut through the stem, which is better for the plant and better for the head. -
Storage starts with the harvest.
Keeping the outer leaves on the head helps the cabbage store longer.
Gardening Lesson
Cabbage rewards patience and consistency.
A steady supply of water, a slow-release fertilizer like feather compost and enough space for the plant to grow are what produce a firm, healthy head. Rushing any of these stages usually shows up in the final crop.
Soshanguve, Pretoria, South Africa
Growing Knowledge. Growing Food.