Dahlia is suitable for growing in loose, humus rich and well drained sandy soil. For potted Dahlia planting soil, it is best to choose vegetable garden soil, rotten leaf soil, sand soil and dung dry preparation. The soil viscosity is heavy. It is better not to use the hardened soil, which is easy to waterlogging and rotten roots.
Dahlia likes water but does not want to accumulate water. It is afraid of water logging and drought. This is because Dahlia has fleshy roots, which are easy to rot when watered too much, but its branches and leaves are luxuriant, its evaporation is large, and it needs more water. Therefore, the principle of "dry through pouring" should be mastered. Generally, in the early stage of seedling growth, the water demand is limited, and it can be watered once a day in sunny days to ensure that the soil is slightly wet. It is not suitable to be too dry or too wet.
In the later stage of growth, the branches and leaves are luxuriant, and the water consumption is more. In sunny or windy weather, the water shortage is easy to occur at noon or evening, so the water quantity should be increased appropriately.
Dahlia is a kind of fertilizer loving flower. Generally, 10-15 Tina should apply thin liquid fertilizer once from the seedling, and another application should be done 7-10 days after budding. When the flower bud is full of color, it is not suitable to apply fertilizer if the temperature is high.
The amount of fertilizer application depends on the growth of the plant. The light and thin leaves are deficient in fertilizer. On the contrary, if the fertilizer is excessive, the edge of the leaves will be scorched or the tip of the leaves will be yellow. The leaves are thick and green, which is suitable for topdressing. The concentration of topdressing should be increased one by one, so as to make the stem strong.
No matter how beautiful the flowers are, they will be damaged, so you should learn to trim them. The pruning of potted Dahlia should be flexible according to the variety. In general, large-scale varieties adopt the unique plastic method, while medium-sized varieties adopt the four plastic methods.
The sole plastic treatment is to keep the top bud and get out all the axillary buds, so as to concentrate nutrition and form the sole Dahlia with low plant and large flower shape.
The four reshaping methods are to remove the heart of the seedling, keep two nodes at the base, and form four lateral branches, each of which keeps the top bud, so as to form a pot Dahlia with four stems and four flowers.
