Black pseudobulbs
I have had blackening pseudobulbs that eventually blackened up the new leaf. I have cut that off and treated with sulfur powder. I read somewhere in the forum of two other things that would work systemically. I can’t locate that post but one was phos. I purchased that and would like to use it as a drench on all of my orchids but don’t have any idea of how to mix it. The instructions are all for citrus fruit, but and veggie application. Can anyone tell me how to mix it for watering orchids?
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