Sunflower is a tropical plant, which likes warm, humid and semi-cool environment. The cold tolerance is not strong, the leaves turn yellow below 20℃, and the lowest winter temperature should be above 10℃, and it will freeze to death at about 5℃.
Therefore, southern China can still be cultivated in the open field, and the Yangtze River basin and its northern area should be preserved in greenhouses. Growth is slow in seedling stage and rapid in later stage. Suitable for loose, well-drained and fertile soil. Dense foliage, evergreen seasons, strong shade tolerance. Sexual preference is warm, humid, semi-cloudy and well ventilated environment, and the lowest temperature in winter should be above 10℃.
It's good to grow white English indoors. Saussurea involucrata is an indoor foliage plant, and Phyllostachys pubescens is suitable for outdoor planting. Solanum lyratum Thunb is a tropical plant, which likes warm, humid and semi-shaded environment. Its cold tolerance is not strong. When the temperature is lower than 20℃, the leaves turn yellow, and the lowest temperature in winter should be above 10℃, and it will freeze to death at around 5℃. Therefore, it can be cultivated in the open field in South China, the Yangtze River basin and its north.