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  • 1 Post By ksriramkumar

Add calcium to phrag potting mix

This is a discussion on Add calcium to phrag potting mix within the General Orchid Culture forums, part of the Orchid Culture category; What is recommended as the best method to add calcium in the form of oyster ...

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  1. #1
    Fred Gorstein is offline Junior Member
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    Default Add calcium to phrag potting mix

    What is recommended as the best method to add calcium in the form of oyster shell to phragmipedium potting mix ?

  2. #2
    ksriramkumar is offline Senior Member
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    can break them with a hammer and mix them. what is the proportion you plan to use?

  3. #3
    Fred Gorstein is offline Junior Member
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    Default Calcium for Phragmipedium

    Quote Originally Posted by ksriramkumar View Post
    can break them with a hammer and mix them. what is the proportion you plan to use?
    I have fragmented the oyster shell into 2-3 mm chips but am unsure as to how best to add it to the potting mix. I have considered merely adding approximately 1/2 teaspoon to a quart of potting mix. Potting mix is mostly medium size fir bark (Orchiata).

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    ksriramkumar is offline Senior Member
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    1/2 a teaspoon sounds too less and actually does no harm if add more. I would suggest you can go to 5-10%. I have read about a few people who use up to 30% for paphs that grow on limestone.

  5. #5
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    phraggy is offline Senior Member
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    Calcium nitrate is the best form of calcium IMO. The roots can take up calcium if applied in this form.

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