In selecting summer spinach varieties, it's essential to choose those that are not too late in the summer season, have strong heat resistance, and grow quickly. Currently, several popular summer spinach varieties are cultivated across different regions of the country.
1. **Almighty Spinach**: This variety was introduced from Hong Kong. It is known for its heat and cold resistance, wide adaptability, and strong winter survival. It grows rapidly at temperatures ranging from 3°C to 28°C. The plant is upright, with a height of 30–35 cm, and has 7–9 leaves per plant, each weighing about 100 grams. The leaves are dark green, thick, smooth, and measure 30–35 cm in length and 10–15 cm in width. It has low astringency and a soft texture. The growth period is 80–110 days, and it is resistant to downy mildew, anthracnose, and viral diseases.
2. **Huasong No.1**: Developed by Huazhong Agricultural University, this hybrid variety matures early, with a growth period of 40–60 days. The plant is semi-erect, reaching a height of 30 cm. Its leaves are scorpion-shaped, with deep notches, and have a blunt tip. The leaves are large and of high quality. It is highly heat-resistant and resistant to downy mildew and viral diseases, with a high yield.
3. **Guangdong Round Leaf Spinach**: Introduced from Guangdong, this variety has thornless seeds and oval leaves. It is very heat-resistant and grows quickly but is not cold-tolerant, so it must be harvested before the cold season arrives.
4. **United No.1**: A hybrid developed by Shanghai Agricultural College, this variety has thorny seeds and semi-open plants. The leaves are arrow-shaped, large, and thick. It grows quickly in hot and rainy seasons, with good seedling development. However, it has a long dormancy period, and its germination rate is lower under high temperatures. It can be harvested 30 days after sowing.
5. **Spring and Autumn Big Leaves**: Introduced from Japan by Shanxi Province, this variety is robust with semi-erect growth. The leaves are clustered, long oval, and blunt-tipped. Each plant weighs about 200 grams, with individual leaves weighing around 20 grams. It has no odor and excellent quality. It is highly resistant to diseases, heat, and late bolting, with a growth period about 10 days longer than general round leaf spinach.
6. **Late Big Leaf**: A new variety selected by the Vegetable Research Institute of Shanxi Agricultural University, this variety has a growth period of over 50 days. The plant reaches a height of 25 cm and develops up to 50 cm. The leaves are wide and arrow-shaped, measuring 32–40 cm in length and 14–18 cm in width, with very few fibers. The seeds are thornless, and it bolts 15–20 days later than other varieties. It typically produces more than 2,500 kg per mu.
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