Lime in pottimg mix - was Bulb requirements - was Ixiolirion

Wed, 25 Jun 2008 19:50:29 PDT
Horticultural neutral is pH 6.5 by convention?
What is the origin of that nonsense?
Plants and soil behave according to chemistry rules, not horticulture.


-----Original Message-----
From: <>
Sent: 6/26/2008 12:50:32 AM
To: Pacific Bulb Society <>
Subject: Re: [pbs] Lime in pottimg mix - was Bulb requirements - was	Ixiolirion

On 25 Jun 08, at 14:30, Mark Mazer wrote, quoting Jane McGary:

> >I grow hundreds of bulbous species that come from areas with 
> >alkaline soil, and I grow them in a slightly acidic but very well drained
> >medium. I've rarely bothered to add lime to my growing mix.
> I am now adding small amounts of lime to all potting mixes.  I think that the
> warmer and higher humidity of North Carolina makes this necessary in contrast to
> the cooler and dryer growing conditions previously encountered in Connecticut.
> From temperate to tropical, add more lime to the mix.

A package of good, reasonably wide-range pH testing paper is a worthy purchase 
for the serious gardener, esp. if you grow a lot of things in pots.

My potting mix is based on material dredged from an old lake bottom that has a 
pH around 4.0. You'd be suprised how much lime I have to add to get the pH up 
to near-neutral 6.5. [Horticultural neutrality is pH 6.5 by convention; not the 
same as chemical neutrality.]

Rodger Whitlock
Victoria, British Columbia, Canada
Maritime Zone 8, a cool Mediterranean climate

on beautiful Vancouver Island
pbs mailing list

More information about the pbs mailing list