Answer: It certainly sounds suspicious, doesn't it. Plants vary in their sensitivity to a gas leak, but it is true that a gas leak can kill plants. You might ask the gas company to do some checks in that area with their special gas sensors, possibly digging and checking along the line. You might also ask them if they might have used a long term herbicide in that area to prevent say tree roots from encroaching on the gas line. It is also possible that "something happened" such as a spill of some kind, or after excavation the soil was replaced in such a way that the subsoil is at the surface, or a bag of concrete mix was spilled, or some other unusual occurrence while they were installing the line underground so that the soil in that area is different. Your county extension might be able to suggest some soil tests to try to determine if there is a way to counter any possible soil problem and neighbors or the builder might remember if anything unusual happened in that location.
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