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Eric Muehlbauer
Guest
I recognize the tag from Andy's......
I recognize the tag from Andy's......
H.P. Norton said that it takes too long to break down the calcium from eggshells so I'm going to look thru the threads here for a liquid solution.
We've gone over this before, but I'll through it out again for discussion.
The point of adding oyster shell or lime is not to supplement calcium (there is more than enough in your fertilizer), but to buffer the pH of your potting mix.
Without lime, crushed coral, dolomite, or oyster shell addition, the pH of your potting mix will be acidic. Parvis (with the exception of delanatii) and brachys come out of limestone based soils that are usually neutral to basic in pH.
There are lots of physiological process that are facilitated at certain pH ranges (such as the uptake of nutrients). So I can't guess which ones they might be for parvis. But if that's what they like to grow in in the wild it's a good starting point for greenhouse culture.