I’d be very careful about using copper this way.
While ingesting small amounts of copper is ok, and in fact a good part of a diet, Ingesting too much copper is not a good thing, and can be toxic.
Having copper piping, etc. in close proximity to a garden risks having it leach into the plants, which might then be ingested. Since copper is a fairly soft metal then rain could slowly corrode it and introduce it to the plants.
I’d be very careful about using copper this way. While ingesting small amounts of copper is ok, and in fact a good part of a diet, Ingesting too much copper is not a good thing, and can be toxic.
Having copper piping, etc. in close proximity to a garden risks having it leach into the plants, which might then be ingested. Since copper is a fairly soft metal then rain could slowly corrode it and introduce it to the plants.
A bit more on copper toxicology here.
And that leaching will be vastly influenced by pH. So if your soil or rain is acidic you’ll get a lot more.