Curly kale, commonly known in Kenyan markets as sukuma matumbo, is an emerging leafy vegetable that is gradually gaining popularity among urban consumers, restaurants, and health-conscious households. Unlike the common flat-leaf sukuma wiki varieties, curly kale has tightly ruffled leaves that resemble the folds of animal intestines, which is how it earned the nickname “matumbo.”
Although still a niche vegetable in many parts of Kenya, demand for curly kale has grown in recent years, especially in supermarkets, organic food outlets, and high-end restaurants. It is valued for its rich nutritional profile, distinctive texture, and strong visual appeal when used in salads, smoothies, and cooked dishes.
For farmers, curly kale presents an interesting opportunity because it can be grown using similar agronomic practices as traditional sukuma wiki while often attracting slightly better prices in specialized markets. However, its commercial success depends on understanding the crop, managing production carefully, and targeting the right buyers.
Understanding Curly Kale as a Crop
Curly kale belongs to the Brassica oleracea family, the same botanical group that includes cabbage, broccoli, cauliflower, and traditional kale varieties. The main distinguishing feature is the highly curled or frilled leaf structure that forms thick bunches of textured foliage.
The crop is a leafy vegetable grown primarily for its edible leaves. Like other kale varieties, it allows repeated harvesting over several months rather than a single harvest event.
Under Kenyan farming conditions, curly kale can remain productive for 4 to 7 months depending on soil fertility, irrigation, and pest management. Harvesting typically begins about 4 to 6 weeks after transplanting, after which farmers can harvest leaves regularly every one to two weeks.
Because it is a cool-season vegetable, curly kale performs best in moderate climates and highland regions.
Climatic and Soil Requirements
Curly kale is relatively adaptable but performs best when grown under favorable environmental conditions.
Ideal growing conditions include:
- Temperature: 15°C to 25°C
- Rainfall: 600 mm to 1,200 mm annually or consistent irrigation
- Altitude: 1,200 to 2,500 meters above sea level
- Soil type: Fertile, well-drained loamy soils
- Soil pH: 6.0 to 7.0
High temperatures can cause faster aging of leaves, while very cold conditions may slow growth. Like other leafy vegetables, curly kale responds well to soils rich in organic matter.
Waterlogging should be avoided because it encourages root diseases.
Suitable Growing Regions in Kenya
Curly kale performs well in most areas where sukuma wiki is traditionally grown, particularly cooler regions with good soil fertility.
Promising production areas include:
- Central Kenya (Kiambu, Nyeri, Murang’a, Kirinyaga)
- Rift Valley highlands (Nakuru, Nandi, Uasin Gishu)
- Western Kenya and Kisii highlands
- Peri-urban areas around Nairobi where vegetable demand is strong
Farmers close to urban markets often benefit most because curly kale is still a relatively specialized vegetable and may not sell easily in remote markets.
Varieties of Curly Kale
Several curly kale varieties are available globally, although in Kenya the selection is still limited compared to common sukuma wiki.
Examples include:
- Green Curled Kale (the most widely available type)
- Winterbor Kale (known for cold tolerance and dense leaf formation)
- Scotch Curled Kale varieties
Seed availability varies depending on agricultural suppliers, but demand for curly kale seeds has increased as more farmers experiment with alternative leafy vegetables.
Seed prices typically range from KSh 400 to KSh 1,200 per 10 grams, depending on the supplier and variety.
Land Preparation and Planting
Good land preparation helps ensure strong root development and consistent leaf production.
The field should be ploughed and harrowed thoroughly to produce a fine seedbed. Incorporating organic matter such as well-rotted manure improves soil fertility and moisture retention.
Typical manure recommendation:
- 2 to 4 tonnes of well-decomposed manure per acre
Nursery establishment
Curly kale is normally grown from seedlings raised in a nursery before transplanting.
Seed rate:
- Approximately 80 to 120 grams of seed per acre
Seedlings are ready for transplanting after 4 to 5 weeks, once they have developed several true leaves.
Spacing
Common spacing practices include:
- 45 cm by 45 cm
- 60 cm by 45 cm
This results in approximately 12,000 to 18,000 plants per acre, depending on spacing and management system.
Transplanting should preferably be done during cool hours of the day to reduce transplant shock.
Growth Timeline and Yield Expectations
Curly kale grows relatively quickly and allows continuous harvesting.
Typical production timeline:
- Germination: 5 to 10 days
- Nursery stage: 4 to 5 weeks
- First harvest: 4 to 6 weeks after transplanting
- Continuous harvesting: every 7 to 14 days
Yield estimates in Kenyan conditions
Yield depends on soil fertility, irrigation, and management practices.
Typical estimates include:
- Small-scale low-input farms: 6 to 8 tonnes per acre
- Moderate commercial management: 8 to 12 tonnes per acre
- Well-managed intensive systems: 12 to 15 tonnes per acre
These yields accumulate over multiple harvests during the production period.
Key Crop Management Practices
Like other leafy vegetables, curly kale requires consistent management to maintain productivity.
Fertility management
Nitrogen is essential for leafy growth. Farmers often apply nitrogen-rich fertilizers after each harvest cycle to encourage new leaf development.
Common fertilization practices include:
- Basal application of DAP or NPK during transplanting
- Top dressing with CAN during growth stages
Organic manure significantly improves soil structure and long-term productivity.
Irrigation
Regular watering is necessary for consistent leaf production. Water stress causes leaves to become tough and reduces yield.
Drip irrigation is increasingly used in commercial vegetable farms because it improves water efficiency.
Weed control
Weeds should be removed early because they compete for nutrients and moisture. Shallow cultivation or mulching can help suppress weeds.
Pest and disease management
Curly kale faces similar pest challenges as other brassica crops.
Common pests include:
- Aphids
- Diamondback moth
- Cabbage worms
Diseases may include:
- Downy mildew
- Black rot
- Leaf spot diseases
Integrated pest management practices such as crop rotation, field hygiene, and regular scouting are recommended.
Harvesting and Post-Harvest Handling
Harvesting typically begins once leaves reach a marketable size. Farmers usually pick the outer leaves while allowing the inner leaves to continue growing.
Harvesting frequency can range from once a week to once every two weeks depending on plant growth rate.
Proper harvesting practices include:
- Using clean knives or scissors to avoid damaging plants
- Harvesting early in the morning when leaves are fresh
- Keeping harvested leaves in shaded conditions to maintain quality
Leafy vegetables lose moisture quickly, so fast delivery to markets is important.
Market Opportunities and Pricing in Kenya
Curly kale is still considered a niche vegetable in many Kenyan markets, but demand is increasing due to changing dietary trends.
Major buyers include:
- Urban vegetable markets
- Supermarkets and grocery stores
- Hotels and restaurants
- Organic food outlets
Prices vary widely depending on location and supply levels.
Approximate farm-gate prices include:
- KSh 20 to KSh 40 per kilogram in open markets
- KSh 40 to KSh 80 per kilogram when supplying specialized buyers such as restaurants or organic stores
A well-managed acre producing around 10 tonnes per cycle sold at an average price of KSh 30 per kilogram could generate roughly KSh 300,000 gross revenue. However, production costs, including labor, fertilizer, irrigation, and pest management, can range between KSh 60,000 and KSh 120,000 per acre depending on input intensity.
Market access is therefore a key determinant of profitability.
Practical Takeaways for Farmers
Curly kale farming offers an interesting diversification option for farmers already producing leafy vegetables. It can be introduced gradually into existing vegetable farming systems.
Farmers considering curly kale production should focus on:
- Starting with small plots while testing local market demand
- Using healthy seedlings and quality seeds
- Maintaining soil fertility through organic matter and balanced fertilizers
- Monitoring pests regularly since brassica crops are vulnerable to insect attacks
- Targeting urban markets where demand for specialty vegetables is stronger
Understanding the market before expanding production is particularly important because curly kale is not yet as widely consumed as traditional sukuma wiki.
Growing Curly Kale Successfully in Kenya
Curly kale farming demonstrates how small adjustments in crop selection can open new market opportunities for vegetable farmers. While the crop shares many similarities with sukuma wiki, its unique appearance and nutritional value allow it to stand out in premium vegetable markets.
Successful farmers focus on soil fertility, proper irrigation, and consistent harvesting practices to maintain high-quality leaves that meet market standards.
Quality seedlings are particularly important for establishing uniform plants and reducing early crop losses. Farmers seeking certified seedlings and expert guidance can contact Organic Farm via website: www.organicfarm.co.ke, Call or Whatsapp: +254712075915, or email: oxfarmorganic@gmail.com.
