When selecting summer spinach varieties, it's important to consider factors such as tolerance to high temperatures, strong growth vigor, rapid development, and adaptability to different climates. Below are several summer spinach types that are well-suited for cultivation across various regions of the country.
All-round Spinach is a variety originally introduced from Hong Kong. It is known for its resilience to both heat and cold, wide adaptability, and strong winter survival. This variety has a late bolting tendency, grows quickly, and can thrive in temperatures ranging from 3°C to 28°C. The plant stands upright, reaching a height of 30–35 cm, with 7–9 leaves per plant, each weighing approximately 100 grams. Its dark green, thick, and smooth leaves measure 30–35 cm in length and 10–15 cm in width, with low astringency and a soft texture. The growth cycle lasts between 80–110 days, and it shows good resistance to downy mildew, anthracnose, and viral diseases.
Huasheng No.1 is a hybrid developed by Huazhong Agricultural University. It is a precocious variety with a growth period of 40–60 days. The plant has a semi-upright growth habit, reaching a height of about 30 cm. Its leaves are shaped like "Ye Ji," with a deep central vein and blunt tips. The leaves are hypertrophic and of high quality. It is highly resistant to downy mildew and virus disease, and produces high yields even under high-temperature conditions.
Guangdong Leaf Spinach was imported from Guangdong. It features thornless seeds and oval-shaped leaves. It has strong heat resistance and grows quickly, but it is not cold-tolerant. Therefore, it must be harvested before the onset of cold weather.
The first hybrid produced by Shanghai Agricultural College is characterized by thorny seeds, a semi-open plant structure, and large, arrow-shaped leaves. It grows rapidly and is more resistant to high temperatures. It is typically sown during hot and rainy seasons to ensure seedling survival. This variety has a long dormancy period, and the germination rate of fresh seeds under direct high temperature is relatively low. It can be harvested within 30 days after sowing.
Spring and Autumn Leaf Spinach was introduced from Japan and cultivated in Shanxi Province. It has a robust growth habit, with semi-upright plants and clustered leaves. The leaves are oblong in shape, with blunt tips and hypertrophic characteristics. Each plant weighs around 200 grams, and individual leaves weigh about 20 grams. It has a mild astringency and excellent quality. It exhibits strong disease resistance, heat tolerance, and delayed bolting compared to regular round-leaved spinach. Its growth period is about 10 days longer than that of ordinary varieties.
Late-Leaf Large Leaf is a variety selected by the Vegetable Research Institute of Shanxi Agricultural University. It has a growth period exceeding 50 days. The plant reaches a height of 25–50 cm, with broad, arrow-shaped leaves that have rounded tips. The leaves are 32–40 cm long and 14–18 cm wide, with very few fibers. The seeds are thornless, and the bolting occurs 15–20 days later than in common varieties. It can yield over 2,500 kilograms per mu.
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