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Lime in potting soil mix

Posted by bkay2000 8a TX (My Page) on
Fri, Mar 30, 12 at 10:42

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?


Follow-Up Postings:

RE: Lime in potting soil mix

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.

RE: Lime in potting soil mix

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



RE: Lime in potting soil mix

I'd definitely add the lime.

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