How could two plants in different locations have the same dna

Answer: The two plants must be allopatric species

Explanation:

Allopatric species of plants of the same species would have the same or closely similar DNA. Even if TWO plants of same species are placed in different geographical locations (whether by natural or man-made factors) they would retain the same DNA.

However, after a long period of time of interacting with their respective environment, there would be lack of gene flow between the two plants and they MIGHT become genetically different (with different DNA).

But before then, the two plants living in different locations with the same DNA is best described as Allopatric species