“A drip system is perhaps the best way to manage your watering,” said Migwi, a 38-year-old farmer-turned-entrepreneur. “And when it’s solar-powered, it’s even better.”

That’s why she invested her savings in an irrigation kit from SunCulture, a Kenya-based startup, to help convert her quarter-acre kitchen garden in Gitaru, northwest of Nairobi, into a 4-acre (1.6 hectare) farm.