More then half have died

It has been a little over a year and half and I have 6 plants out of 25 that are still growing. None of them have grown 3 feet in the last year all of them have grown between 6 to 8 inches and that is it. Not impressed with that description versus what I got because I was told that they would be 8 to 12 inches and they are now all about 14 inches so unless you count the length of the root system then they were just barely 8 inches when I got the surviving ones.

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