As food prices rise and climate patterns shift, many small-scale farmers and home gardeners are turning to crops that are easy to manage, need little input, and still yield well. One of these crops is the turnip. It’s easy to plant, grows quickly, and is packed with nutrients.
Turnips are affordable, widely available, and play a growing role in nutrition and the local food system.
They grow well in rural and urban spaces and are even used in traditional remedies. This makes turnips a useful crop, especially now, as Mzansi faces challenges with food security and health.
Good for your gut, heart, and more
Turnips – related to cabbage, broccoli, and kale – have a mild sweet flavour and are rich in vitamin C, fibre, and potassium, says crop specialist Nthabelenga Pebana from Cape Town.
She explains that turnips are a highly nutritious root vegetable that promotes general health due to their high vitamin, mineral, and fibre content.
They are also a good source of vitamin C, an important antioxidant that boosts the immune system, promotes wound healing, and protects cells from oxidative stress.
“Turnips’ high fibre content assists digestion, helps maintain healthy cholesterol levels, and promotes gut health by supporting beneficial bacteria in the intestines,” says Pebana.
She adds, “Turnips are low in calories but high in potassium, which is essential for maintaining normal blood pressure and heart function.”
The presence of glucosinolates in turnips, she says, contributes to their possible cancer-fighting capabilities, as they have been found to help in detoxifying processes in the body.
“Turnips are also high in folate, which helps with cellular repair and red blood cell synthesis, both of which are essential for general well-being.”
Nthabeleng Pebana
Pebana tells Health For Mzansi that turnips may help prevent or manage chronic conditions due to their nutritional profile.
She explains that turnips are a good food choice for people with or at risk for diabetes because they are low in carbohydrates and have a low glycaemic index, which helps control blood sugar levels.
“Turnips’ high fibre content helps to improve blood sugar regulation by delaying the absorption of glucose.”
Pebana further notes, “Turnips are also naturally low in sodium and high in potassium, which helps control blood pressure by preventing the negative effects of too much salt and promoting normal vascular function.”
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Not for everyone
Even if turnips are generally safe and nutritious, Pebana warns that overconsumption may raise concerns, especially for people with certain health conditions or medications.
“Turnips contain goitrogens, compounds that can interfere with thyroid function, especially in people with iodine deficiency or hypothyroidism; however, cooking significantly reduces this effect.”
Other risks include:
- Mildly lowers blood sugar, which could be a concern for those on insulin or diabetes medications if eaten in large amounts without enough carbohydrates.
- They may be a risk to people with kidney disease or on potassium-sparing diuretics, as they can raise potassium levels.
- Excessive intake may cause digestive discomfort, like gas or bloating.
A smart crop for cool regions in SA
Turnips grow best in regions with the right climate and soil, says Cape Town-based horticulturalist Nomfusi Ntsobi. With the right conditions, they can thrive in many parts of South Africa.
She highlights key factors for success, including planting times, soil preparation, crop care, and how to handle the harvest to maintain quality and extend shelf life.
Turnips grow best in regions with moderate temperatures and sufficient rainfall, says Ntsobi.
The Western Cape, KwaZulu-Natal Midlands, Eastern Cape Highlands, and parts of Mpumalanga have suitable conditions due to their cooler climates and well-distributed rainfall.
The ideal time to plant turnips is during the cold seasons.
“For sowing to enable establishment of the plants before winter frosts, mid to late March or early April is recommended.”
Planting can continue into August or September in areas where winter temperatures remain mild. However, Ntsobi cautions that roots must be harvested before the heat of summer sets in, as high temperatures can affect root quality.
“The cycle of growth from planting to harvesting is between 6 to 10 weeks, depending on the variety and the prevailing environmental factors.”
Get your soil ready
She explains that turnips prefer fertile, well-drained soil with a pH between 6.0 and 6.8.
“The root system benefits most from sandy loam soils because they create optimal conditions for growth and minimise water accumulation.”
Nomfusi Ntsobi
Before planting, she recommends adding organic material like compost to improve soil structure. “The soil should be deeply tilled at a minimum depth of 20 cm to break up compact layers and help grow healthy root systems.”
Turnips are prone to pests like aphids, wireworms, and root maggots. “These organisms can cause considerable damage to both foliage and roots,” Ntsobi warns.
She advises using integrated pest management methods like crop rotation, pest-resistant varieties, and insecticides when necessary.
“Consistent monitoring and removing diseased plants help prevent the spread of infestations.”
Harvesting should happen when roots are firm and around 5 to 8 centimetres in diameter. “It’s important to handle the roots carefully to avoid bruising,” Ntsobi says. Remove the greens immediately after harvesting to reduce moisture loss.
For storage, she recommends keeping the roots in a cool, humid environment.
“This helps prevent dehydration and wilting. With proper storage, turnips retain their quality and shelf life, ensuring they remain suitable for market distribution.”
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