Carol Mutua
Department of Crops
Egerton University
Nyamira County

Double rewards from farmer growing wonder crop stevia

He was then advised to use stevia leaves in his tea and porridge daily, a step that he says helped him manage the disease.

It is the relief he got from the sweet leaf herb in 2009 that nudged him to start growing the crop.

Stevia leaves have a long history of use as sweeteners, due to presence of sweet crystalline glycosides called steviosides, which are 200 to 300 times sweeter than sucrose.

As a natural sweetener, it is very healthy because it contains no calories. Therefore, it is recommended for diabetic individuals and used in preventing lifestyle diseases and controlling obesity because one gets the sweetness without gaining calories.

“I was diabetic from 2003 to 2008 and could not take any sugary foods or drinks. But stevia leaves helped me,” says Siango, a resident of Gachuba village, Nyamira County.

To begin the venture, he leased a quarter acre of land after getting certified seeds from an international organisation, which buys the produce, says the 59-year-old.

Besides the sale of the leaves, he has now moved to growing the seedlings where buyers have to part with Sh50 for each.

Stevia stays in the seedbed for 30-40 days after which one can transplant to a well-tilled land whose soil is evenly drained.

In the seedbed, farmers are advised to water the seedlings twice a week, with regard to weather patterns. To achieve the required quality of natural sweetness, a good sunlight wavelength is required.

“Prepare one-foot cubic metre holes, add compost manure then plant your seedlings. After three months, your plants will have matured and ready for harvesting,” he says, adding that the plant can be harvested after every three months since the leaves sprout again after cutting.

Carol Mutua, an expert from the Department of Crops, Horticulture and Soils at Egerton University, advises that stevia should be planted on raised beds at a spacing of 30cm between rows and 20cm between plants.

“The field should be kept weed-free throughout the growing period. Organic farming is preferred in stevia production where manure is mainly used at a rate of 20 kilos per square metre,” she says.

She notes fertilisers can be used depending on soil fertility. NPK is used as a basal fertiliser while CAN for top dressing. Stevia is rarely affected by pests because it has insect-repellent properties, says the agronomist. “After harvesting for the fist time, you don’t need to purchase seeds again. You can plant the splits so long as they are not infected.”

“The firm buys my produce each harvesting season and ships it to their factories where they use a solar dryer to get rid of all moisture. They then grind it into fine white pellets that are packed for sale to local supermarkets,” says Siango, adding a 150g pack of stevia powder is Sh995.

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