The requirement of Forsythia on soil is not high, but it grows best in the loose and fertile soil.
The soil shall not be too dry, and the basin soil shall be kept moist at ordinary times, but no water shall be accumulated. Pay attention to drainage in rainy season to avoid plant rot caused by water accumulation in the basin soil.
Forsythia likes sunshine. Although it can stand half shade, it's better to keep it in a sunny and airy place outside during its growing period. It doesn't need to be shaded in summer and high temperature.
Forsythia can endure cold. In winter, it can live in a cold room, or it can bury the flowerpot in the outdoor shelter.
In spring and autumn, Forsythia suspensa should be applied with a thin liquid fertilizer or compound fertilizer which is rotten every 15-20 days. In summer, fertilization should be stopped. In autumn, fertilizer with high phosphorus content, such as potassium dihydrogen phosphate, can be applied to the leaves to promote the formation of flower buds.
In winter, the number and quantity of watering should be reduced as much as possible, so as to keep the soil from freezing, and forsythia can survive the winter safely.
The germination ability of the base of Forsythia suspensa is very strong. Every year, many branches will grow and disperse nutrients. If you want to increase the bearing rate of Forsythia suspensa, you need to prune it frequently. If you want to prune the bearing branches that have been blooming and bearing for many years and have begun to age, you can cut them short or heavy (i.e. Cut 2 /3 of the branches), which can promote the emergence of strong branches below the cutting mouth, restore the tree momentum and improve the bearing rate.
In autumn, the main pruning method is sparse pruning. Except for 3-7 vigorous growing trunks per pier, the other thin, withered and old branches should be pruned as the case may be.
In winter, the dead branches, cladistic branches, overlapping branches, Cross branches, delicate branches, as well as excessive long branches and pest branches shall be cut off.
