Albizia julibrissin, commonly known as the silk tree or mimosa, has sweet, neutral properties in traditional Chinese medicine and is described as calming to the spirit. It has long been regarded as an “auspicious tree” and has been used traditionally as a tonic and, in some contexts, as a vermifuge.
In Chinese herbal medicine, the flowers (he huan hua) and bark (he huan pi) of Albizia julibrissin have been used to support emotional well-being. Traditional applications include relief of anxiety, stress, and low mood, and it is sometimes referred to as the “happiness herb.” The flowers have also been used historically for insomnia, forgetfulness, sore throat, and bruising.
The primary constituents of Albizia julibrissin include saponins and tannins, along with a variety of phytochemicals such as β-sitosterol, amyrin, spinasteryl glucosides, and several flavonoids. Notably, the plant contains flavonol glycosides such as quercetrin and isoquercetrin, compounds that have demonstrated sedative activity in experimental settings. Antioxidant activity has also been observed, particularly from bark extracts.
Scientific research on Albizia julibrissin is limited. In one animal study examining sedative effects, a methanol extract of fresh flowers and two isolated flavonol glycosides—quercetrin and isoquercetrin—were found to prolong pentobarbital-induced sleep time in mice in a dose-dependent manner. These findings support traditional claims of calming activity and suggest a potential for interaction with sedative medications.
However, such effects have not been well documented in human studies. Reports of excessive sedation appear uncommon at traditionally used doses, but caution is warranted, particularly for individuals using prescription sedatives or other central nervous system depressants.
