Source for Superphosphate?
I have a potting mix recipe that calls for superphosphate. I have managed to gather the Pro-Mix but we can't find superphosphate anywhere.
Can anyone recommend a mailorder source, preferably one with low shipping or at least one that would have some other useful items for growing AVs and seeds
I've had such a difficult time finding a good growing mix and I want to use this to pot up several plantlets ASAP.
Diana in PA