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 Post subject: Anyone tried vermiculite?
PostPosted: Sat Sep 03, 2016 6:01 am 
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Location: Vällingby, Sweden
I just removed a mounted Dendrobium trantuanii from some cork and put it in vermiculite. Has anyone tried growing dendrobiums in this material, and how did it work out?

From what I've read it keeps moisture well, but still doesn't get too compact to let the roots breathe.

I have some moniliforme in sphagnum, and they're doing really well, but I thought I'd try something new for a change and see how it goes.

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 Post subject: Re: Anyone tried vermiculite?
PostPosted: Sat Sep 03, 2016 8:06 am 
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My experience with dens is that they readily attach to pots, clay or plastic and to media. Its well known that they do not like to be repotted because of this. In fact I just leave in pot and place everything into a bigger pot. See photo.
It will be interesting to see if this works as I've never seen it used before.

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 Post subject: Re: Anyone tried vermiculite?
PostPosted: Sat Sep 03, 2016 3:41 pm 
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Joined: Fri Sep 17, 2010 7:52 am
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Location: Oak Island, NC
In my opinion, vermiculite is a terrible ingredient in orchid potting media, or as a medium itself.

It is a type of mica that has been fired to force of the water from the minerals that bind the layers together, so the particles "fluff up."

Once you start watering it, eventually that water will allow the particles to collapse again, turning it into a suffocating sludge.

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 Post subject: Re: Anyone tried vermiculite?
PostPosted: Sat Sep 03, 2016 11:50 pm 
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Location: Vällingby, Sweden
raybark wrote:
In my opinion, vermiculite is a terrible ingredient in orchid potting media, or as a medium itself.

It is a type of mica that has been fired to force of the water from the minerals that bind the layers together, so the particles "fluff up."

Once you start watering it, eventually that water will allow the particles to collapse again, turning it into a suffocating sludge.

Ah... thanks for the warning! I'd better relocate the plant to something else then, asap.

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 Post subject: Re: Anyone tried vermiculite?
PostPosted: Tue Sep 06, 2016 11:34 am 
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Joined: Fri Aug 21, 2009 7:50 am
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Location: Hawaii
I agree with Ray. Vermiculite works for only a short period for orchids.

I grew Den. trantuanii in fairly tightly packed nz sphagnum in a clay pot in very bright shade. Kept moist, but I have lots of heat year round. I was able to grow it from plug to flowering, but it struggled. It's too hot in Honolulu for this species, so I gave it to a friend to grow in Pahoa, Big Island where its way cooler and more humid.


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