In [Genesis 21:33](https://www.biblegateway.com/passage/?search=Genesis+21%3A33&version=NET), the text states,

> 
> Abraham planted a tamarisk tree in Beer Sheba.
> 
> 
> 

This is in the context of a treaty regarding a well in Beer Sheba, but it seems at first glance to have no relationship or bearing on the text. This typically means that I am lacking some sort of cultural or other significance.

So why is this seemingly random event noted in the text? What is the significance of this and what bearing or relationship does it have to the surrounding text? What purpose does it serve?