According to legend, the Devouring Gourd of Usambara was discovered by a group of little boys at play. “Look at how big that gourd is getting!” said one of the boys. To their surprise, the gourd responded. “If you pluck me, I’ll pluck you!” it said. The boys ran home and told their mother, who refused to believe them. But their sisters insisted on seeing the large gourd, and when they were taken to it, they said as their brothers had, “Look at how big that gourd is getting!” This time the gourd did not respond, and the girls went home to complain about their brothers being liars.
As the gourd was not plucked, it continued to grow. Eventually it became the size of a house, uprooted itself, and went about swallowing everyone in the village. After consuming everyone within reach, it rolled into a lake.
Only one woman had survived the gourd’s rampage, and she was pregnant. When her son was born, they lived together in the ruins of the village. When the son got around to asking where his father was, his mother told him “He was swallowed by a gourd, which is now in the lake”. The son decided to avenge his father, and went out to the lake where he could see the gourd’s ears sticking out of the water, and he proceeded to taunt the vegetable. “Gourd, come out!” he yelled. “Gourd, come out!” Annoyed and enraged, the gourd hauled itself out of the lake, but the boy was ready for it, and fired a volley of arrows into it. The tenth arrow killed it, and it died with a roar that could be heard all the way to Vuga. The boy cut it open with a knife, released the villagers unharmed, and went on to become a great leader of his people.
Gourds are not the only plants that devour and kill people. Another carnivorous plant, a pumpkin, grew over the burial location of an evil shapeshifting porcupine. It repeated everything that was said to it, and when an axe was brought to destroy it, it proceeded to swallow everyone. The poisonous Sala fruits of the Ronga have arms and legs, and wield spears and shields.
Devouring Gourd folklore: https://abookofcreatures.com/2015/09/30/devouring-gourd/
Bantu Mythology: https://en.wikipedia.org/wiki/Bantu_mythology