Re: Marl Soil Recipe

From: Phil Wilson (cp@pwilson.demon.co.uk)
Date: Wed Jun 14 2000 - 02:05:39 PDT

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Date: Wed, 14 Jun 2000 10:05:39 +0100
From: Phil Wilson <cp@pwilson.demon.co.uk>
To: cp@opus.hpl.hp.com
Message-Id: <aabcdefg1808$foo@default>
Subject: Re: Marl Soil Recipe

Jay,

>Posted this request last week ...
>
>Nobody's experimented with home-made alkaline bog soil mixes in cultivation
>for S. purpurea and D. linearis?
>
>Can't believe I'm breaking new ground here ...
>

I've never made a soil for either of the marl bog species but I do grow
my temperate and Mexican Pinguiculas in an alkaline mix. For the
temperate species I tend to use a 33/33/33 mix of peat, perlite and
regular garden lime. The peat serves to maintain the right moisture
level while the garden lime corrects the pH level since often these
plants grow in limestone areas.

For my Mexican Pinguicula species I have used a freer draining mix of
pure tufa rock though recently I prefer peat based soils as there are
environmental concerns regarding the mining of tufa.

I have never measured the pH of these soils but I would think they are
pretty alkaline. If you are concerned about the pH not being high enough
you could substitute all or most of the peat for fine grade vermiculite.
The finer grades tend to provide more moisture retention and less
drainage.

Regards,
Phil Wilson
Email: cp@pwilson.demon.co.uk

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