Using expository text to introduce grapes can be introduced from three aspects: grape varieties, grape nutritional value, and grape health benefits.

1. Grape varieties. There are many varieties of grapes, including purple grapes, green grapes, red grapes, etc. Different varieties of grapes vary in taste, color and shape. For example, purple grapes have a strong fruity aroma and are suitable for making wine; green grapes have a crisp taste and are suitable for eating fresh or making juice.

2. The nutritional value of grapes. Grapes are rich in many nutrients, such as vitamin C, vitamin K, potassium, etc. These ingredients help maintain good health, enhance immunity, promote bone growth, heart health, and more. In addition, grapes also contain a variety of antioxidant substances, such as resveratrol and flavonoids, which can resist free radical damage and prevent aging and disease.

3. The health benefits of grapes. In addition to their nutritional value, grapes have a variety of health benefits. Antioxidants in grapes can resist free radical damage and prevent aging and disease. The vitamin C in grapes can enhance immunity, promote wound healing and iron absorption. Grapes can also lower blood pressure, lower cholesterol, and prevent heart disease.

Growing environment of grapes:

1. Climatic conditions: Grape growth requires specific climatic conditions, including sufficient sunshine, warm temperatures and moderate rainfall. Grapes need a lot of sunlight for photosynthesis to accumulate energy and nutrients. Warm temperatures help grapes grow and ripen, while moderate rainfall provides enough moisture to aid growth and development.

2. Soil conditions: Grape growth requires specific soil conditions, including well-drained soil, suitable soil pH and rich soil nutrients. Well-drained soil prevents excess moisture in the roots, which can affect grape growth and development. Suitable soil pH can provide the nutrients needed by grapes and promote root absorption. Rich soil nutrients can provide the nutrients needed by grapes and promote the growth and development of grapes.

3. Irrigation conditions: Grape growth requires sufficient water, so irrigation is an important growth condition. Proper irrigation can provide sufficient moisture to promote the growth and development of grapes. Irrigation water needs to be clean to avoid contamination of the grapes.