1, lettuce Lettuce is a cold-resistant vegetable, which likes cold climate and is not resistant to high temperature. The germination temperature is above 4℃, and 15-20℃ is the best. If the temperature exceeds 30℃, it will not germinate. Its seedlings can tolerate sub-zero low temperature, the suitable temperature for seedling growth is 15-20℃, and the growth temperature for stem is 1 1- 18℃. Lettuce likes a large temperature difference between day and night, so it needs a higher temperature for flowering and fruiting, and the optimum temperature is 19-22℃.

2, leeks. Leek is cool, cold-resistant and heat-resistant. The optimum temperature for seed germination is above 65438 02℃, and the growth temperature is between 65438 05℃ and 25℃. The underground part can withstand lower temperatures. Moderate light intensity and strong shade resistance. However, the light is too weak, the accumulation of photosynthetic products is less, the tillers are few and weak, the yield is low, and it is easy to premature aging; Too much light, too high temperature, too much fiber and poor quality.

3.asparagus. Asparagus has a strong adaptability to temperature, which is both cold-resistant and heat-resistant, and can be cultivated from sub-cold zone to subtropical zone. But it is most suitable for temperate cultivation with distinct seasons and pleasant climate. In the cold zone, when the temperature is -33℃ and the thickness of frozen soil reaches 1 m, it can still overwinter safely, with low yield but good quality.

The initial germination temperature of asparagus seeds is 5℃, and the optimum temperature is 25 ~ 30℃. When the temperature is higher than 30℃, the germination rate and germination potential decrease obviously. Breeding with seeds can continue to grow for more than 10 years. In winter, the aboveground parts wither, and the rhizomes and fleshy roots enter dormancy and overwinter; In warm areas in winter, the dormancy period is not obvious.

4. Toona sinensis Toona sinensis likes temperature, which is suitable for cultivation in areas with average temperature of 8- 10℃, and its cold resistance increases with seedling age. One-year-old seedlings planted directly may be frozen at about-65438 00℃.

5, fungus. Auricularia auricula is resistant to high temperature, drought and humidity, and has high nutritional value. Saxifraga Saxifraga feeds on seedlings, twigs or leaves, with soft and smooth texture and high nutritional value. Can make soup, stir-fry, hot food, cold salad, etc. Its taste is fragrant, and it is as crisp and refreshing as eating fungus when chewing.

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