I have just been reading on how to fix copper-contaminated soils.
There are lots of research studies on bioremediation using bacteria.
However, I could find zero products for sale for the everyday gardener.
This study implies growing sunflowers and adding citric acid to the soil will help the sunflowers suck out the copper to help clean up your soil. Not so sure.
https://www.researchgate.net/p...
You can easily dig them all up and grow them in pots with fresh soil. In zone 8b, I imagine they will all do fine in pots. Or cover your beds over and put raised beds on top with fresh soil.
May also be worth having your soil pH tested, and tested for metal content.
These guys seem to test for some contaminants, not sure about copper:
https://rxsoil.com/
There is also this interesting thread that presents some ideas:
The thread "Short scapes?" in
Daylilies forum
