Rings of Power: Why The Lindon Tree In Khazad-Dum Is So Significant

gamerant.com:

Trees have always held amazing significance in the Lord of the Rings and the Hobbit, and it seems as though the Rings of Power will follow in these same footsteps. In the second episode of the series, fans were introduced to the golden sapling of the tree in Lindon, growing deep in the heart of the dwarven kingdom of Khazad-Dum. But as with all trees in Middle Earth, this small piece of life growing deep underground is more significant than it at first appears. It represents the bond and kinship that exists between Durin and Elrond, and in that sense, between the elves and the dwarves, long before the two races become at odds with one another.

The sapling itself was a gift from Elrond. It began as a tiny seed that was given to Durin in the earliest days of their alliance, as a symbol of good faith between them. Durin planted the seed in the earth, and as it began to grow and bloom, so did their alliance. Eventually, they began to see each other more as family than as simply acquaintances who occasionally crossed paths to achieve the common good. And although the tree is thriving, there is an unsettled nature to their friendship by the second episode of the Rings of Power. Elrond has missed several important events in Durin’s life, including his marriage to Disa and the birth of their children.

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Nonetheless, the Durin still cares for the tree each day, a sure sign of his commitment to their kinship. Disa says asks about the nature of the tree and where it came from, to which Elrond replies:

“A seedling of our great tree in Lindon. The very symbol of our people’s strength and vitality.”

So the trees seem to reflect the lives lived by those around them.