Its roots can enter deep soil, which can reach 100-200cm. Its lateral roots grow horizontally, with many fibrous roots and root hairs. Its root system is more developed, more widely distributed in the soil, its root growth rate is even faster than the stem, especially when the flower disc is formed, it grows fastest, when the seed is mature, the root will not grow, it will wither
Its stem is upright, with bristles on the surface, rough. In the later stage, the stem will be lignified, and the interior will be empty. Its hypocotyl has different colors, which is a very important way to identify its varieties. Its different varieties stem height difference is quite big, even if is the same variety, because the environment each aspect reason, the height is also different.
Its cotyledons are two, the true leaves are in pairs, growing in the area of 1-3 nodes below the stem, the true leaves can grow larger, and the leaves have bristles. The flower grows at the top of the stem. Its color and size are related to the variety. Its color can attract insects to pollinate. Its fruit is melon seeds, edible, seeds are longer, generally black and white stripes, thick peel.
It likes sunshine, doesn't like darkness, can endure drought, doesn't like waterlogging. Can endure the cold, even in winter, its roots can also spend the cold winter underground. It can withstand fine frost, but the growth period of seedlings needs higher temperature, the best temperature is 20 ℃, the hottest temperature is not more than 32 ℃, and the lowest temperature is not less than 10 ℃. It likes thicker soil with more humus and better water permeability. It can grow in the soil with slight acid to neutral, and the best pH is in the range of 6.2-6.7.
Although both of them are yellow, the difference is very obvious. Chrysanthemum flowers grow more thin and long, the former flowers are relatively thick and large. Chrysanthemum flowers are constantly spreading out, the former only has petals on the edge of the flower tray. And the latter's pistil is very difficult for us to see. The former's pistil can not only be clearly seen, but also the melon seeds on it. The latter's leaf is smaller, is the sawtooth shape, the former's leaf is wider, also has the small tooth on the edge.
