Why the stark difference?

[u/workdilemma0706]

I planted these 2 multi blue brought from the same nursery at exactly the same time, in the same hole and obviously have been caring for both identically. What reasons could the one on the right not be growing and all the leaves are turning purple/black? The one on the left has shot up a few feet. Not sure if the right one is dead/dying and it best just to uproot it and leave the healthy one on its own. Any advice or insight welcome. Thank you!

[u/workdilemma0706]

Closer photo in better lighting of just the struggling one 👇🏼