Chilli is better adapted to hot weather, but it does not set fruit well when night temperature exceeds 24°C. Optimum day temperatures for its growth range from 20 to 30°C. When the temperature falls below 15°C or exceeds 32°C for extended periods, growth and yield are usually reduced. Chilli plants are photoinsensitive and day length does not affect flowering or fruit set. Chilli grows best in a loam or silt loam soil with good water holding capacity, but can grow on many soil types, as long as the soil is well drained. Soil pH should be between 5.5 and 6.8.