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Which drainage material?

  • Black lava rock

    Votes: 3 50.0%
  • LECA

    Votes: 3 50.0%
  • Matala

    Votes: 0 0.0%
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Discussion Starter #1
I just bought an 8 gallon glass bubble bowl to make an open-topped jewel orchid/begonia terrarium. It's 12" tall x 16" wide with a 10" opening on top, to give a sense for size. My ambient humidity is around 20-30%, and I'm hoping that once the plants grow in they'll create enough of a humid micro-climate in the glass that I can leave the top open, but I will be covering it at least at first, airing it out a little each day and watering as necessary. The idea here is to go as low-tech as possible.

Given my low humidity, I don't think that wicking from the drainage layer is necessarily a bad thing. I'm intending to do drainage layer, then screen, then ABG. I'll add in substrate from my tank so I should be able to get a springtail population started. Would lava rock gravel work as well as LECA as a bioactive drainage layer? The LECA product I'm looking at is Josh's Frogs false bottom, it looks like it's a nicer dark brown than other products, but I think black lava rock would look really nice. Or should I go with something that wicks less, like Matala?
 

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Discussion Starter #2 (Edited)
Oh suggestions for ABG materials are also welcome, I'm going to try making my own. Horticultural charcoal - "coarse" or "fine"? Orchiata orchid bark - "classic" or "precision"?

And intended inhabitants, for those interested:
Anoectochilus roxburghii (dark leaves with copper veins)
Anoectochilus roxburghii (emerald green leaves with single silvery midrib)
Begonia baik
Begonia metachroa
Dossinia marmorata
var. Dayii
Macodes petola
Marcgravia sp.
Azreal - maybe
Selaginella picta

Hoping to get a Malaxis metallica and Begonia sp. Julau in future, I'll see how well this set fills it in.
 

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I think since it's all hand-watering you ought to be in great control of how much excess water you apply (or don't). Therefore I don't think you need to assume there will be free water in the drainage layer available for wicking. I mean, put it there if you discover you need it, to maintain high enough soil moisture for leaf turgor, but otherwise - just don't.

So with that in mind I would suggest using whatever looks best. I like the black scoria idea the best, personally.

You could also approach the question empirically. How much does scoria wick, anyway? In the event you did want to maintain some free water down there, say for vacation freedom or whatever - how far will it wick upward simply due to capillary action? Someone on here (Chlorophile???) did some empirical work with clear glass jars and various media.

Anyway - sounds like a sweet little project! Have fun with it.
 

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You just need to decide the order of importance:

Look and feel?
Organic(ish)?
Wicking potential?

Matala doesn't wick. That's probably the only plus. I actually love it, because I find my older terrariums with LECA wick moisture way too much. The other two are more of a "what looks better to you" decision.
 

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Discussion Starter #5
I think since it's all hand-watering you ought to be in great control of how much excess water you apply (or don't). Therefore I don't think you need to assume there will be free water in the drainage layer available for wicking. I mean, put it there if you discover you need it, to maintain high enough soil moisture for leaf turgor, but otherwise - just don't.

So with that in mind I would suggest using whatever looks best. I like the black scoria idea the best, personally.

You could also approach the question empirically. How much does scoria wick, anyway? In the event you did want to maintain some free water down there, say for vacation freedom or whatever - how far will it wick upward simply due to capillary action? Someone on here (Chlorophile???) did some empirical work with clear glass jars and various media.

Anyway - sounds like a sweet little project! Have fun with it.
Good points! I like that vacation freedom idea. In this case it sounds like wicking will be a benefit, since I can control how much standing water exists in the drainage layer.
 

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That's the one! Yep, thanks for digging. People could benefit from revisiting that not-so-old thread.
 

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Discussion Starter #8
That's the one! Yep, thanks for digging. People could benefit from revisiting that not-so-old thread.
This is making me rethink the drainage layer in my paludarium - I started with PVC rounds and egg crate, but added perlite because so many springtails were falling through. Now I'm thinking the perlite is contributing to the constant "almost wet" condition of my substrate. Still don't know what to do about the springtails though.

But I'm going with black lava rock for the jewel orchid terrarium, and will control standing water in the drainage area depending on the moisture level I'm looking for.
 

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This is making me rethink the drainage layer in my paludarium - I started with PVC rounds and egg crate, but added perlite because so many springtails were falling through. Now I'm thinking the perlite is contributing to the constant "almost wet" condition of my substrate. Still don't know what to do about the springtails though.

But I'm going with black lava rock for the jewel orchid terrarium, and will control standing water in the drainage area depending on the moisture level I'm looking for.
The springtails can and will climb back up if they want to
 
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