What about Contaminants and Poisons in the Soil?
While this problem is not widespread, you should be aware of the possibility you may have contaminants or poisons in your soil. A good example could be one based on D.D.T. D.D.T. was used many years ago for the treatment and control of White ants and Argentine ants before it was banned as being not suitable. D.D.T. has a long residual effect. This means it can remain in the soil for a long time, and possibly progress through the food chain to you. You can get your soil tested. If you provide such a service, please contact me.