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 Limestone VS Lime

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powerinformation

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Number of posts : 25
Location : Western Australia
Registration date : 2014-03-17

PostSubject: Limestone VS Lime   Wed Apr 23, 2014 9:15 pm

Hey all,

Thinking about repotting some of my cacti.
I checked out some soils today and thought the crushed limetone looked good.
I've heard some cacti this is their natural soil?

Anyway I asked and was told the the lime would probably burn them.

Are limestone and lime different?
Is crushed limestone OK to use for a majority (or all) of the growing soil?

Some insight is always really appreciated, CHEERS!
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Cereoid

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PostSubject: Re: Limestone VS Lime   Wed Apr 23, 2014 10:07 pm

Limestone is calcium carbonate while lime is (usually) calcium oxide and/or calcium hydroxide. All of these are alkaline but lime is more so and much more water soluble so lime is a much more dangerous chemical to be introducing calcium with.

Limestone is also alkaline but it is not very water soluble so is not going to raise the pH by a great amount, but it can neutralise acid soils so be careful if you are growing acid-loving cacti. Also keep in mind that the plants don't necessarily need limestone just because they grow on it in the wild: they may just be tolerant of it unlike other competing species.

Several people do however use it and get good results (I don't bother, but then again I mostly grow columnars and epiphytes rather than the miniatures that grow on it in the wild) so use limestone if you wish, and preferably get some advice from some experienced growers.
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powerinformation

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Location : Western Australia
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PostSubject: Re: Limestone VS Lime   Wed Apr 23, 2014 10:09 pm

Thanks alot,
I want to move away from potting mix entirely... though much of my decisions are aesthetic or just an idea/vibe

Its good to ask around on this forum thanks!
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