At Sweet Waters, a village in central Kenya, Veronicah Nyambura stands under the hot sun between two fields. One is full of lush plants - but the other has crops so wilted that their leaves have curled up.
The green land is planted with tea tree, an Australian native that thrives in this semi-arid part of Kenya. Opposite is a field of maize, which suffers in years of poor rains and high temperatures.
“Maize is very disappointing. You plant but you're never sure whether you'll harvest anything,” said Nyambura, who has planted a quarter-acre of tea trees.
The 65-year-old said she harvests 900 kg of tea tree branches every six months from that bit of land. When it was planted to maize, she got about 270 kg of grain every nine months, she said.
Many farmers in this part of Laikipia County – like farmers in many parts of the world - cannot afford to buy seeds for alternative crops better suited to drought, so keep planting maize.