Sunflower fruit is achene, which is used to be called seeds and melon seeds, commonly known as sunflower seeds, and is edible. Fruit includes pericarp, seed coat and embryo. Edible seeds are long, with black and white stripes in the skin, thick skin, accounting for more than 40% of the seed weight, and 1000-grain weight 100~200 grams. Oil seeds are short and small, with black skins and thin skins, accounting for about 20 ~ 30% of the seed weight, and the 1000-grain weight is 40 ~110g. ?

Sunflowers can be planted in all seasons, especially in summer and winter. The flowering period can last for more than two weeks. Varieties can be divided into "common ornamental" varieties or "edible" varieties, and individual ornamental varieties are characterized by short plants, usually not more than half a meter.

Ornamental sunflowers are therefore suitable for planting in potted plants; Edible varieties are relatively tall, planted in the soil of normal open-air nursery, which can grow to more than 2 meters. The growth of sunflower is relatively agile, and the flowering period can last for more than two weeks. The growth of sunflower is closely related to temperature, moisture, light, soil and other factors.

Extended data:

Maintenance conditions of sunflower

1, soil: Sunflowers do not have too high requirements for soil, because its growth ability is very good. However, it is best to use soil with good drainage performance and humus, and it is best to apply some base fertilizer.

2. Illumination: It must be exposed to light in the process of growth and flowering, and it is best to breed in the sunny place. If it is potted, you can move outdoors to bask in the sun.

3. Temperature: it is not cold-tolerant, and the temperature of breeding in the daytime should be adjusted at about 2 1-27℃, and the temperature at night should not be too low, but should be adjusted at 10- 16℃. In addition, the temperature difference should not be too small, otherwise its stems and leaves may grow in vain.

4, moisture: pay attention to watering when maintaining, if it is short of water for a long time, its leaves may wither due to lack of water. Water can be replenished once every 1-2 days during the growth period, and more water can be watered when the temperature is high.

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