Picking the heart can make Robinia pseudoacacia bloom many times.

Hairy Robinia pseudoacacia, also known as Jiangnan Robinia pseudoacacia, blooms only one crop of flowers a year under natural growth conditions. A large amount of nutrition is used for shoot growth, which can grow up to more than one meter. When summer comes, the strong wind can blow the growth direction of the twigs, forming a partial crown phenomenon. It not only reduces the ornamental property of Robinia pseudoacacia, but also increases the workload of winter pruning. In winter pruning, many branches that have grown for a year are cut off or truncated as useless branches, and short branches will continue to grow in vain the following year.

Making use of the characteristics of multiple growth of new shoots of Robinia pseudoacacia and the technique of coring at the sight of new shoots, the vegetative growth of Robinia pseudoacacia can be transformed into promoting flower growth, which can make Robinia pseudoacacia blossom many times a year, prolong the flowering period and reduce the growth of branches. In this way, the crown of Robinia pseudoacacia is compact, the ornamental is greatly improved, and the amount of pruning in winter is reduced.

When the new tip of Robinia pseudoacacia grows to about 5 cm, remove the top tip of about 1 cm in line with the principle of keeping inflorescence as much as possible. After about a week, the second shoot will sprout on the first shoot, and the secondary inflorescence will sprout at the same time. When the secondary shoot grows to about 5 cm, pick the heart again and promote the new shoot and the third stubble inflorescence for three times. By repeating the above heart-picking technique, Robinia pseudoacacia can blossom for more than five crops. In Qingdao area, repeated heart plucking can prolong the flowering period of Robinia pseudoacacia to late July.