The growing period of red kidney beans can be 60-90 days for short ones and 80-120 days for long ones. Red beans are warm, light-loving and resistant to waterlogging. The full-life cycle needs more than 10 ℃, effective cumulative temperature of 20-25 ℃, generally in 8-12 ℃ above the beginning of germination and seedling.

Red beans react sensitively to light, too early sowing to extend the growth period, maturity is not earlier. Therefore, the introduction of seeds from high latitude to low latitude will be early maturity, while the introduction of seeds from low latitude to high latitude will extend the maturity period.

Extended information

1, plant morphology

Annual herb. Stem slender, up to 1 meter long or more, yellow villous when young, glabrous when old. Leaves pinnately compound with 3 leaflets; stipules peltate, lanceolate or ovate-lanceolate, 10-15 mm long, acuminate at both ends; stipules subulate, leaflets papery, ovate or lanceolate.

2. Fruit characteristics

Olong-rounded and slightly compressed, 5-8 mm long, 3-5 mm in diameter; surface purplish-red, lusterless or slightly glossy; on one side there is a linear protruding umbilicus, biased to one end, white, about 2/3 of the total length, the middle is sunken into a longitudinal groove; on the other side there is an inconspicuous ridge. Hard, unbreakable.

Baidu Encyclopedia - Red Kidney Beans