Lime in potting soil mix

bkay2000(8a TX)March 30, 2012

I have a recipe from this list that I got on the Hosta forum that calls for lime. I haven't been adding it.

As I understand it, lime makes for a more alkaline mix. Do I have this right?

Our water is alkaline, so wouldn't I want to skip the lime?

bkay

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fortyonenorth(6b)

Depends on several factors. First, you don't mention the components of the mix. If it's heavy on the bark and peat, the pH will be low. By way of example, I mixed up an 8:1:1:1 blend of pine bark, peat, turface and perlite and the pH tested out to 5.4. If the mix is comprised of ingredients with a closer-to-neutral natural pH, then you may not require lime.

Alkaline irrigation water will raise the pH over time, but it shouldn't be viewed as a substitute for lime when you wish to adjust your substrate pH in relatively short order.

    Bookmark   March 30, 2012 at 12:44PM
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bkay2000(8a TX)

This is the one I'm using for hosta:

3 parts pine bark fines
1 part sphagnum peat (not reed or sedge peat)
1-2 parts perlite
garden lime
controlled release fertilizer
micro-nutrient powder (substitute: small amount of good, composted manure

Thanks,

bkay

    Bookmark   March 30, 2012 at 8:21PM
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fortyonenorth(6b)

I'd definitely add the lime.

    Bookmark   April 1, 2012 at 10:22AM
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