Re: CULT: ?help - potting mix

I am by no means an expert on this but I have used this mix to start seeds and
to pot iris.  When potting iris I add a little sand to the mix.  If I was
putting it in a "bed" instead of a pot I would add sand, compost and alfalfa
pellets.  I think the MG Potting Mix (if it's the one I used) is acutally
soilless and is specifically designed for containers.  Planting in to a bed
would change those dynamics and I would amend with the listed goodies.  Of
course, I amend every bed I plant iris in with those goodies.  

Just one
persons opinion.
 
Dana Brown
ddbro@sbcglobal.net



----- Original Message
----
From: Linda Mann <lmann@lock-net.com>
To: iris@hort.net
Sent: Thursday,
September 6, 2007 8:05:31 AM
Subject: [iris] CULT: ?help - potting mix


No
help from you guys when I asked before, & cruising the web didn't 
turn up
much.  So I'll pester you folks again:

I'm using Miracle Gro Potting Mix for
an emergency planting bed 
(unexpected bunch of extra plants).

Have any of
you used it for growing irises and if so, is there anything 
I need to add to
it to adjust pH or fertility?

It looks like the slow release fertilizer
included in the mix that says 
it will last for 3 months is low on phosphorus.
I found some web info on using it to grow marijuana in pots (!) that 
said the
pH is around 5.5, so figure it needs some lime.  And something 
that implied
it might be a bit low on magnesium.  Added crushed 
dolomitic limestone should
take care of that.

If I add fertilizer high in phosphorus, will that be too
much 'salt'?

I couldn't find any information on how much phosphorus (or other
nutrients, for that matter) are in the mix other than the added time 
released
fertilizer.

Is there another gardening discussion forum with searchable
archives 
where I might be able to find out?
-- 
Linda Mann east Tennessee USA
zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
Region
7, Kentucky-Tennessee <http://www.aisregion7.org>
American Iris Society web
site <http://www.irises.org>
talk archives:
<http://www.hort.net/lists/iris-talk/>
photos archives:
<http://www.hort.net/lists/iris-photos/>
online R&I
<http://www.irisregister.com>
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