Because the potatoes grow inside the hay bale, the bale can be positioned in areas where the soil is unsuitable for gardening or even on top of paved areas. However, water does drain from the bottom of the bale, so choose an area where this is not an issue.
Bacteria have exhibited colistin resistance in the past, but this time it is different: Previous forms of the resistance weakened the microbes, and the resistance genes were located on DNA that was not easily shared among bacteria.
This is generally the case. The genomic DNA is the same unless there are mutations. However, I would like to point out that bacteria also can contain plasmid DNA. Plasmids are not always properly segregated during replication. So one daughter cell may retain a plasmid while the other does not because a copy of the plasmid is not transported across the cell before division.