Asparagus: erect herb, up to 1 m. The root thickness is 2-3mm. The stem is smooth, the upper part often droops in the later stage, and the branches are weak. Every 3-6 leaflike branches are clustered, nearly flat and cylindrical, slightly blunt, slender, often slightly curved, 5-30 mm long and 0.3-0.5 mm thick; Squamous leaves have short or near-distance spines at the base. Each flower 1-4 axillary, green and yellow; The pedicel is 8- 12(- 14) mm long, and the joint is located near the upper or middle part. Male flower: Perianth is 5-6 mm long; Filaments are inserted in perianth segments below the middle; The female flower is smaller and the perianth is about 3 mm long. Berries are 7-8 mm in diameter, red at maturity and have 2-3 seeds. The flowering period is May-June, and the fruiting period is 9-65438+1October.
Growth habit: Asparagus has strong adaptability to temperature, 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℃, which is higher than 30℃.
Asparagus is suitable for sandy loam with rich organic matter, and grows well in fertile soil with loose soil, deep soil layer, fertilizer and water conservation and good air permeability. Asparagus can tolerate mild saline-alkali, but when the soil salt content exceeds 0.2%, the plant development is obviously affected, the absorption roots shrink, the stems and leaves become emaciated and die gradually.
Asparagus has small transpiration, developed root system and relatively drought tolerance. However, if the bamboo shoots are too dry during the picking period, it will inevitably lead to tender stems, shrinking growth buds and serious yield reduction. Asparagus is extremely intolerant to waterlogging, and accumulated water will lead to root rot and death. Therefore, planting plots should be high and dry, and drainage should be paid attention to in rainy season.