Shop Orchid Care OrchidTalk Orchid Forum Weather Station Links Nursery

Welcome to OrchidTalk Orchid Forums


The Friendliest Orchid Community on the Internet!


  •  » Learn to Repot your Orchids
  •  » Learn Orchid Care Tips and Secrets
  •  » Find the perfect Orchid for your Growing Environment
  •  » Chat with Orchid Growing Professionals

OrchidTalk - "Bringing People Together to Grow Orchids Better!"


Let us help you grow your Orchids better; Join our community today.


YES! I want to register an account for free right now!


Register or Login now to remove this advertisement.

Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 26
Like Tree9Likes

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; Actually, thanks for bumping this. More on topic: I've heard crushed egg shells can also ...

Click here to increase the font size Click here to reduce the font size
  1. #11
    Shaydra is offline Senior Member
    Favorite Orchid(s)
    All of them!
    Join Date
    Jun 2007
    Location
    Michigan
    Posts
    654
    Member's Country Flag

    Default

    Actually, thanks for bumping this.

    More on topic: I've heard crushed egg shells can also be used as a calcium source. Is this true? Also that if you use epsom salts in rain or RO water for any reason (I tried once because I heard it can sometimes reverse yellowing) you should also use calcium supplement.

    What else would you use epsom salts for?


  2. #12
    John D. is offline Member
    Favorite Orchid(s)
    Phragmipedium
    Join Date
    Aug 2007
    Location
    Powhatan VA
    Posts
    79

    Default

    Yes crushed eggshell work also. They and oystershell and small limestone all provide some buffering of pH in the mix. Dolomitic limestone contains some magnesium as well as calcium. All are slow acting. Calcium nitrate is quick and the nitrate is good also. Magnesium sulfate also suppiles a little sulfur along with the Mg. Rough proportion is 2:1 or 3:2 - CA:MG Both help the plant to produce chlorophyll. If you mix the two don't put them in solution at high concentration. You can get a preciptate of Ca SO4 (gypsum). When dissolving fert I use 1/4 teaspoon normal fert + 1/8 t. of Calcium nitrate per gal. after that is dissolved then I add a little less than 1/8 t. of the epsoms salt and mix again. Often you can find Calcium Nitrate (small BB sized pellets)in 50 lb quantities for landscaping fert or used as an additive to concrete to keep it from freezing when pouring in cold weather.

  3. #13
    Pete's Avatar
    Pete is offline Member
    My Grow Area
    In a Greenhouse.
    Favorite Orchid(s)
    Paphiopedilum
    Join Date
    Aug 2007
    Location
    Da Big Island
    Posts
    43

    Default

    i know this is an old thread but just to add my 2 cents. there are many orchids occuring in nature in various types of limestone habitats, including many paphs. at my nursery we have turned to the oyster shell as it lasts longer than other forms and still gives some lime initially as well. i put a little in the mix but moreso use it as a topdress on the pots, this way you can see when its gone and add more. ive found in little experiments (with paphs) that the limestone is indeed beneficial in root production if nothing else. on sanderianums and phillipenense's that were put into the same mix with added oystershell and without, 6 monthes later, upon checking root health the limestone that had been washed down into the pots was all adheared to the roots and the roots of these plants seemed much more vigorous than those without..

  4. #14
    kfir from israel's Avatar
    kfir from israel is offline allways press Ctrl+W
    Real Name
    kfir stolero
    Favorite Orchid(s)
    paphs n` vandas
    Join Date
    May 2008
    Location
    haifa-israel
    Posts
    749
    Member's Country Flag

    Default

    hi
    not only paphs need calcium
    many more to......

  5. #15
    Scucci is offline Junior Member
    Join Date
    Jul 2008
    Posts
    7

    Default

    Just to revive a dead topic. I also keep reef tanks, and we stopped using dolomite years ago. If I had to take a guess, I'd say that some of the larger substrates we use in reef tanks would be great to use with orchids, something like the cheap bags of large crushed coral would probably be good all around for any orchids that might use calcium. Plus the larger pieces in the cheap crushed coral will also be great for helping with drainage. Just make sure you rinse it well... actually, would probably do better to soak it for a good while just to make sure any remaining salts are out. I'd imagine the easiest way to do it is would be the same way we 'cure' homemade "live rock"... put it in the back of your toilet for a few weeks. Any salts will leech out, then when ever you flush; insta-water change.

    Anywhos, just my 2 cents.

  6. #16
    AtantaR's Avatar
    AtantaR is offline 0101101000101110
    Real Name
    Andrew
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    Hhhmmmm?
    Join Date
    Aug 2009
    Gender
    Male
    Location
    Massachusetts
    Posts
    930
    Member's Country Flag

    Default

    so just plan old crushed egg shell would do the trick?..I do use egg shell for my compost to add calcium but that undergoes a decomposition process.....Does anyone know if it would be sufficient enough for calcium intake over a short period of time? Flaked? Powered? or if recommended at all?

  7. #17
    Paph Yeo is offline Senior Member
    My Grow Area
    Under Lights.
    Favorite Orchid(s)
    Paphs
    Join Date
    Apr 2010
    Location
    Singapore
    Posts
    163
    Member's Country Flag

    Default

    Quote Originally Posted by Brutal_Dreamer View Post
    What are your thoughts on adding crushed oyster shells into your potting media? What plants thrive in media with higher calcium levels? Which would not benefit from higher calcium levels? When creating your lists please use both the plants name and genus to help out new growers. Instead of saying 'most paphs do well with increased calcium', give examples of your first-hand experience and the plants you grow.

    Cheers!
    BD
    I grow brachys (concolor, niveum, godefroyae and leucochilum) which are supposed to be calcium-loving. I stopped using for a while and did not noticed any much impact as they are still growing well and flowering.

  8. #18
    BearWithMe's Avatar
    BearWithMe is offline Member
    Real Name
    Daniel
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    Dendrobium
    Join Date
    Oct 2010
    Location
    US Pacific Northwest, Vancouver WA
    Posts
    69
    Member's Country Flag

    Default

    I keep thinking calcium shouldn't be an issue with epiphytes, but maybe they get it from debris. I read an article online. The calcium part said:

    "Calcium is necessary for strong cell growth and division. Calcium deficiency is one of the most common mineral deficits in orchids. Insufficient calcium can stunt new vegetative and root growth, cause yellow leaf margins and create black spots on leaf tips that spread down the leaf blade, deforming and eventually killing new leaves. ... sometimes overlooked because it usually occurs during warm weather and resembles sunburn in appearance. It can a1so be confused with the damage caused by
    over-fertilization. An over-fertilized orchid will first have blackening of the younger foliage (not just the new leaf, as in calcium deficiency) and possibly some of the older leaves as well. In severe cases, root injury and even plant death may follow."


    I don't think my plants have that problem. new growth looks good, in most cases more than old growth. The cymbidiums might be an exception, they do have a few black leaf tips. plus, mostly using rain water and weekly/weakly with occasional flushing, maybe I have a deficiency Im not aware of.

    I was wondering about eggshell calcium. I let eggshells dry out and crush them, then spread on the garden. You can see me outside sometimes spreading them. I think the neighbors might think I have someone cremated and am spreading ashes. Maybe I should mix a few into the orchid potting mix just in case.

  9. #19
    orchidlady's Avatar
    orchidlady is offline Senior Member
    Real Name
    Susan
    My Grow Area
    Under Lights
    Favorite Orchid(s)
    Phal and Paph species
    Join Date
    Apr 2009
    Location
    Seattle, WA
    Posts
    899

    Default

    If you are using a balanced fertilizer and plants are healthy, I wouldn't worry about calcium deficiency and needing to add supplemental calcium. There are some Paphs that grow on calcareous substrates (often limestone rocks/cliffs) that many growers feel that there is benefit to using crushed oyster shell or other calcium supplement. The species include most of the Parvisepalum (except delenatii) and Brachypetalum species as well as some others. I know growers who supplement their Paphs as a general rule, and others that don't and both have healthy, blooming plants. I personally use some oyster shell on my Parvis and Brachys and they seem to be doing fine.

    Susan

  10. #20
    gillianreynolds's Avatar
    gillianreynolds is offline Junior Member
    Join Date
    May 2011
    Posts
    1

    Default

    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.

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. Paphiopedilum - use of calcium in the potting medium
    By Germinatorman in forum Orchids Which Benefit from Extra Calcium
    Replies: 8
    Last Post: April 26th, 2010, 08:55 AM
  2. Do You Use Calcium
    By Bikerdoc5968 in forum General Orchid Culture
    Replies: 6
    Last Post: February 15th, 2009, 09:45 PM
  3. Sea Shell Candle
    By rich63 in forum The Outback Terrace Bar
    Replies: 13
    Last Post: September 26th, 2008, 08:45 PM
  4. Coconut Shell Chips (CSC)
    By Tanya in forum General Orchid Culture
    Replies: 6
    Last Post: May 14th, 2008, 11:28 PM
  5. Paphs...oyster shell question
    By mtequine in forum Genus Specific
    Replies: 4
    Last Post: January 22nd, 2008, 01:11 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OrchidTalk --An Orchid Growers Discussion Forum brought to you by River Valley Orchidworks. A World Community where orchid beginners and experts talk about orchids and share tips on their care, cultivation, and propagation.