Okra is a high-grade nutritious and healthy vegetable, which is very popular all over the world. Unique taste, smooth and juicy, deeply loved by people. In many African countries, vegetables have become the first choice for athletes. Cowpea is a kind of vegetable which is abundant in summer. Thick meat can be fried, refrigerated and pickled when scalded. Cowpea is rich in nutritional value. The content of protein is higher than that of tomato, and the content of sugar, calcium and vitamins is also high. Cowpea has strong heat resistance. In summer, when the temperature is above 35℃, it can still grow normally, with normal pod setting and no blooming. Frozen vegetables were first produced in Africa and introduced to China in recent two years. Many people have never seen iced vegetables, but iced vegetables are a kind of vegetables with high nutritional value, which can not only quench thirst, but also supplement nutrition and salt. Iced vegetable is a kind of sun-resistant and salt-tolerant plant and vegetable. One advantage of planting frozen vegetables in summer is that they germinate faster and more, because the most important temperature for germination is 30 degrees.

Asparagus is a rare vegetable with rich nutritional value. Asparagus contains many elements needed by human body, and has certain curative effect on hypertension, fatigue, cardiovascular disease and nephritis. It is also a green and healthy anti-cancer vegetable. Asparagus is most suitable for planting in summer, because its seeds need high temperature to germinate. If the temperature is low, germination will be slow, so summer is a good time to plant asparagus in the north and south. Water spinach, also known as unintentional vegetable, is the main vegetable in summer and autumn, with rich nutritional value. Eating it can relieve summer heat, detoxify and maintain beauty. Water spinach, mugwort leaf, amaranth, etc. Not afraid of hot and humid, it is a typical summer dish.

Bitter gourd is native to tropical areas, which requires high temperature resistance, heat resistance and cold resistance. However, after long-term cultivation and selection, bitter gourd has strong adaptability and can adapt to 10-35℃. The optimum temperature of bitter gourd flowering and fruiting is about 25℃. In the range of 14-25℃, the higher the temperature, the better the growth and development of bitter gourd plants. So it is suitable for planting bitter gourd in summer. The suitable temperature of pepper is between 15-34 degrees. The suitable temperature for seed germination is 25-30℃, and higher temperature is needed at seedling stage! Lettuce likes nutrient-rich humus or garden soil. When planting, just sow the seeds of lettuce on the prepared soil, water the seeds, and finally cover them with fine soil. In the subsequent curing process, pay attention to watering every 2-3 days. The soil should be kept moist, but there should be no water accumulation. It will germinate in about two weeks. After germination, the watering amount should be reduced appropriately and watered once every 5 days or so. Pick the lettuce in time when it is ripe, otherwise the edge of the leaves will turn yellow.