Silk tree (Albizia julibrissin), also known as Mimosa or He Huan Pi in Traditional Chinese Medicine (TCM), is primarily used based on traditional principles rather than modern scientific validation for supporting the Spleen body system. In TCM, the Spleen is thought to govern digestion, energy production, and emotional stability. Silk tree bark and flowers are traditionally used to "calm the spirit," alleviate anxiety, and relieve symptoms associated with emotional distress, such as insomnia or irritability, which are sometimes linked to Spleen disharmony in TCM theory.

Classical TCM texts describe silk tree as having properties that nourish the heart and calm the mind, and it is also believed to "harmonize the Spleen" by addressing emotional imbalances that can impact digestive health. However, while there are animal and in vitro studies on silk tree’s potential neuroprotective and mood-modulating effects, there is little direct scientific evidence linking silk tree use specifically to Spleen function as understood in Western medicine.

Therefore, its use for supporting the Spleen is rooted in tradition, with a moderate level of historical evidence but limited scientific validation. Most modern research focuses on its anxiolytic and antidepressant properties rather than direct effects on the digestive or metabolic roles of the Spleen.