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Lost Crops of Africa: Volume II: Vegetables
Low Temperature Long beans virtually cease growing when daily maximum temperatures are below 20°C. They must be sown after all danger of frost has passed, and to germinate well the soil should be 20-22°C, otherwise the seeds tend to rot.
High Temperature Long beans prefer high temperature, conditions under which other green beans cannot be produced. Environments with full sunlight attaining daytime temperatures of 25-35° C with nighttime temperatures that stay above 15° C are preferred.
Soil This plant thrives in average garden soil. The plant is a true legume with nitrogen-fixing symbiosis; soil with already too much nitrogen favors leaf growth over pods.