Spinach is one of the strongest cold-tolerant vegetables in green leafy vegetables. Adult plants with sharp-leaved spinach can completely overwinter in the open field at a minimum temperature of minus 10 °C in winter. Some varieties with strong cold resistance can withstand a short-term low temperature of 30-40 ° C when there are 4-6 true leaves. The adaptability of spinach is wide, the suitable temperature for growth is 15-30 °C, the optimum temperature is 15-20 °C, and the seeds can germinate at 4 °C. The soil in early spring can be sown when the soil is thawed. The suitable temperature for germination is 15-20 °C. When the temperature is higher, the germination rate is lowered.
Spinach bolting and flowering are affected by the length of sunshine, and the convulsions are accelerated as the temperature increases and the number of sunshine hours increases. Spinach is not tolerant to drought, and it grows vigorously in a humid environment. The quality is good. When the soil is dry, the growth is slow, the leaves are aging, and the quality is poor.
The requirement of spinach for soil is that it can be cultivated except for acidic soil, and other soils can be cultivated, especially in moist and humus-rich sandy loam. Spinach is a fast-growing vegetable with high planting density and high yield, so there needs to be sufficient quick-acting nutrient supply during the growing season.
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