The following verses explain the origin of the tree of Samsara and the origin of bondage. Similar explanation is given in Gita where the description of inverted tree is mentioned.
145. Of the tree of Samsara ignorance is the seed, the identification with the body is its sprout, attachment its tender leaves, work its water, the body its trunk, the vital forces its branches, the organs its twigs, the sense-objects its flowers, various miseries due to diverse works are its fruits, and the individual soul is the bird on it.
146. This bondage of the non-Self springs from ignorance, is self-caused, and is described as without beginning and end. It subjects one to the long train of miseries such as birth, death, disease and decrepitude.
147. This bondage can be destroyed neither by weapons nor by wind, nor by fire, nor by millions of acts – by nothing except the wonderful sword of knowledge that comes of discrimination, sharpened by the grace of the Lord.
148. One who is passionately devoted to the authority of the Shrutis acquires steadiness in his Svadharma, which alone conduces to the purity of his mind. The man of pure mind realises the Supreme Self, and by this alone Samsara with its root is destroyed.
149. Covered by the five sheaths – the material one and the rest – which are the products of Its own power, the Self ceases to appear, like the water of a tank by its accumulation of sedge.
Source: Vivek Choodamani