Sand for potting mixes
Sat, 15 Nov 2014 14:19:45 PST
So, I suspect that calcium carbonate sand might change the pH, and that is why it is undesirable for potting mixes?


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From: penstemon
Sent: ‎Saturday‎, ‎November‎ ‎15‎, ‎2014 ‎5‎:‎07‎ ‎PM
To: Pacific Bulb Society

>I have heard for years that one needs to use “silica sand” for bulb potting 
>mixes. I wonder how “silica sand” differs from other sand. I try to find 
>very coarse sand because it is not as likely to compact. The best stuff I 
>found was from a stream bed. But was it “silica sand?” Isn’t sand generally 
>a silicate mineral anyway?

I would have said yes, but a quick check of the apparently-omniscient 
Wikipedia says that silica sand is the most common form of sand, followed by 
sand from calcium carbonate (aragonite).
The sand I use is the stuff called "paving sand"; comes in bags. The grains 
aren't uniform in size.


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