Penstemon container media
I've been growing several penstemon species in my nursery and am having difficulty with root rot and poor root health. I am using a commercial high porosity growing mix to which I am adding even more perlite. Almost all of my other plants do well in this mix, but the results with penstemons are really spotty. I am thinking I might need a completely different potting mix and am willing to make up my own. Does anyone have any suggestions? I am trying to manage my root rot disease by cultural means rather than regular fungicide drenches.