Johnathan
Omono
Sooooooo........ a 50/50 blend of pumice and DE should be magical is what you are all saying?
Do any of you keep your trees in 100% pumice?
- Thread starter Mike Corazzi
- Start date
Yugen
Yamadori
John P.
Chumono
These roots:
were made in 100% pumice since the “tree” was this big:
So who knows. I’ve also grown other ficus in 100% pumice. Probably wouldn’t do it with maples or elms, but would think olives would be fine.
were made in 100% pumice since the “tree” was this big:
So who knows. I’ve also grown other ficus in 100% pumice. Probably wouldn’t do it with maples or elms, but would think olives would be fine.
fredman
Masterpiece
There ya go
. It's expressed differently and i'm not to flash in maths... 
https://abqbonsaiclub.com/bonsai-soil-article/
Last edited:
Shima
Omono
Oops, I miss-read a previous post.
Shima
Omono
I'm using pumice and orchid seedling bark. Perfect size.
RKatzin
Omono
Yes, I saw this in large grow boxes where the trees were left to grow for 3-5yrs, some as long as 7yrs. I tried different mediums, some pure turface mvp, some mixed with various organics, some in pumice/turf mixes, and some in just pumice.
In smaller pots and repotting at regular intervals you probably won't see the separation as pronounced as long term growing out.
RKatzin
Omono
I have dozens of maples growing in pure pumice. Also Hawthorne, Ginko, Hornbeam, linden, Hinoki, junipers, birch, beech, oaks, elms and others.
John P.
Chumono
You’re in beautiful Oregon. I’m in coastal Southern California. I’ve tried it with pre-bonsai maples, but would be concerned to try it in a bonsai pot here. I’d add bark.
fredman
Masterpiece
I'm interested to know why you would add bark John?
TN_Jim
Omono
Pure glass is probably 0%, pumice is not....Maybe ~70-78, ain’t none..
sorce
Nonsense Rascal
RKatzin
Omono
A broad generalization on climates. You probably have much higher humidity than Southern Oregon, at least where I'm located, east of the Intercostal mountains. Our summers are hot and very arid. Usually zero precipitation from June through September.
I have yet to see any tree take a dive after repotting into just pumice. Trees that were not doing so well in mixed medium showed marked improvement. I contribute this to overall healthier root mass.
TN_Jim
Omono
John P.
Chumono
I guess just my impression that it retains moisture a bit more than pumice.
Mike Corazzi
Masterpiece
I now create my own "mix" of .....potting soil.
40 % or so small (not fine) pumice in the potting soil that's fir bark, worm castings and some other stuff.
So my "potting soil" really isn't.
It keeps the PS from becoming a black sponge.
Oh yeah...forgot. It's NOT what I called pumice for the substrate. It's the additive.
40 % or so small (not fine) pumice in the potting soil that's fir bark, worm castings and some other stuff.
So my "potting soil" really isn't.
It keeps the PS from becoming a black sponge.
Oh yeah...forgot. It's NOT what I called pumice for the substrate. It's the additive.
fredman
Masterpiece
Surprisingly pumice contains more moisture..and holds on to it for longer than pine bark. I did a simple test by wetting and weighing and it sure did surprise me.
I always added bark to have a organic fracture in there. Now i'll add it to better the CEC.
Shima
Omono
To prevent burning surface roots on warm days I have shredded sphagnum on all bonsai. Just a few hours with an open mix can result in cooked roots.
Shima
Omono
Especially in shallow pots.
fredman
Masterpiece
When I did that I use to put small pebbles (or something similar) on top of the sphagnum because it dried so quickly. The moss don't wet easy when it is dry.
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