Harvesting
Potato harvesting in South Africa has a number of complexities involved in terms of climate, marketing, cultivar and more.
When to harvest potatoes in South Africa?
South Africa is one of only a few countries in the world where the climate and soils are sufficiently diverse to enable year-round potato production. Of course, each part of the country has its own optimal window for planting and harvesting potatoes.
Farmers can take advantage of supply-and-demand pricing dynamics by selling their harvests at times when potato supplies from other areas of South Africa are dwindling or not yet available.
GoldenGrow owner Graeme Jarvie uses precision farming to time potato production optimally. Situated in Greytown, KZN, an area with frequent winter frosts, and high clay, low pH gives GoldenGrow a relatively narrow window to plant, harvest and market their seed potatoes. Planting too early, for example, means that the plants will grow tall, which means they become more exposed to winter frost damage and require more sunlight.
In November and December, the Midlands mistbelt is often misty and drizzly, with suboptimal sunshine and heat units, which means that GoldenGrow needs to manage fungal leaf diseases during this time. But harvesting after February means market competition from potatoes harvested in parts of the Free State at that time.
If harvesting runs behind schedule, potatoes ready for harvesting will end up sitting unnecessarily long in the soil, increasing the risk of soil-borne pests and diseases. They could even start rotting. These subgrade potatoes then sell at lower prices. As you can see, there is a lot to consider in timing the potato planning and harvesting process!