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Oyster Shell Calcium

This is a discussion on Oyster Shell Calcium within the Orchids Which Benefit from Extra Calcium forums, part of the General Information category; Originally Posted by gillianreynolds calcium carbonate from oyster shells and just pure carbonate calcium ( ...

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  1. #21
    orchidlady's Avatar
    orchidlady is offline Senior Member
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    Quote Originally Posted by gillianreynolds View Post
    calcium carbonate from oyster shells and just pure carbonate calcium ( I have seen on bottles of calcium) are the same or different. I am a little confused. I have always assumed that if the calcium is from oyster shells the lable says so. But now I am not sure. if the bottle says carbonate does that mean its from oyster shells.
    Oyster shell is just one possible source of calcium carbonate. For example, egg shells are also composed of calcium carbonate. Calcium carbonate can also be made chemically. Therefore, if it says it is specifically from oyster shells then it should be. If not, there may be another source.

    Susan

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    The bio availability differs between each source of calcium carbonate (CC) like lime stone, oyster shell, egg shell etc. Even though they are primarily CC, they also have other components. Like in egg shell the CC is bound together my a protein matrix in oyster shells it is bound by chitin and some more complex proteins and polysaccharides making it less soluble and less bio available.

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    Hey all, looking for info on calcium for different orchids I found this thread. I have calcium grains that are used for 'fertilizing' gardens. Can I safely use that for the orchids too?

    I read '1 teaspoon of calcium, 3-4x a year' for Dendrobium phalaenopsis. Any types of orchids that do NOT like to be calcium-o-fied?

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    Thanks For the advise

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    Hi I came across this thread as I need to repot all my paphs and as I live near the sea I wanted to use crushed oyster shell in my substrate. Can anyone tell me if there is a "best way" to add the shell to the mix? Sprinkled on top? mixed evenly throughout the substrate?. I was thinking of doing both, but since I have not repotted yet, I thought I would ask here. My paphs are all in a mostly bark mix & grow well but are long overdue for some fresh medium. Thanks in advance

  6. #26
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    I've never heard of using crushed shells in a planting medium. How interesting. It make sense though. Hope it works out well. Actually, I didn't know they need extra calcium. Let us know how it fares.

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