As a newbie gardener, I am confused between gardening and potting soils
as sold in the stores. Obviously, plants can grow in gardening soil, so
why it can't or should not be used in a pot? What's the difference?

On Tue, 02 Jun 2009 12:57:38 -0500, AKT wrote:

As a newbie gardener, I am confused between gardening and potting soils
as sold in the stores. Obviously, plants can grow in gardening soil, so
why it can't or should not be used in a pot? What's the difference?

You're not supposed to use either potting or gardening soils in
containers. Containers require a potting mix (big difference) because a
container is a closed environment which is very unlike growing plants in
mother earth.

For more info on this see this article on the gardenweb website in the
container gardening forum. Around 4 years ago I read this and switched my
container garden to a pine bark based potting mix which I make myself.
This article is still generating comments and questions all these years
later.

http://forums2.gardenweb.com/forums/...1724775.html?6

Thanks, but what is potting soil for if not for plants in the pots?

AKT wrote:
Thanks, but what is potting soil for if not for plants in the pots?

I was looking forward to your getting a variety of answers. I'm no
expert but I use potting soil for house plants and plain old cheapest
bagged topsoil for my container grown tomatoes, peppers, eggplants and
cucumbers.

On Wed, 03 Jun 2009 07:36:01 -0400, Frank
wrote:

AKT wrote:
Thanks, but what is potting soil for if not for plants in the pots?

I was looking forward to your getting a variety of answers. I'm no
expert but I use potting soil for house plants and plain old cheapest
bagged topsoil for my container grown tomatoes, peppers, eggplants and
cucumbers.

I found nothing better than home-made potting soil. Not exactly sure
what is in the bagged products, but these bags (including Miracle
Grow) are not consistent. Bagged soil should be heated to kill
insects, mold and bacteria. I heat mine to 300 degrees.

"Phisherman" wrote in message
...
On Wed, 03 Jun 2009 07:36:01 -0400, Frank
wrote:

AKT wrote:
Thanks, but what is potting soil for if not for plants in the pots?

I was looking forward to your getting a variety of answers. I'm no
expert but I use potting soil for house plants and plain old cheapest
bagged topsoil for my container grown tomatoes, peppers, eggplants and
cucumbers.

I found nothing better than home-made potting soil. Not exactly sure
what is in the bagged products, but these bags (including Miracle
Grow) are not consistent. Bagged soil should be heated to kill
insects, mold and bacteria. I heat mine to 300 degrees.

Many bagged soils, composts, mulches, and manures are clearly labled either
"sterilized" or "nonsterilized", the sterilzed costs a few pennies more but
I'm not about to waste fuel cooking many cubic feet of soil at home, nor am
I willing to spend my time and energy at so frivolous a task when I can buy
soil already sterilized so inexpensively. And I've found the national
brands to be reasonably consistant, as consistant as any claimed to be
custom mixed at some local nursery.

In article ,
Phisherman wrote:

On Wed, 03 Jun 2009 07:36:01 -0400, Frank
wrote:

AKT wrote:
Thanks, but what is potting soil for if not for plants in the pots?

I was looking forward to your getting a variety of answers. I'm no
expert but I use potting soil for house plants and plain old cheapest
bagged topsoil for my container grown tomatoes, peppers, eggplants and
cucumbers.

I found nothing better than home-made potting soil. Not exactly sure
what is in the bagged products, but these bags (including Miracle
Grow) are not consistent. Bagged soil should be heated to kill
insects, mold and bacteria. I heat mine to 300 degrees.

180F (internal temp) for 20 min. will sterilize the soil. I usually
sterilize in 2 - 3 quart quantities (without internal thermometer)
for 30 min.
--

- Billy
"For the first time in the history of the world, every human being
is now subjected to contact with dangerous chemicals, from the
moment of conception until death." - Rachel Carson

http://www.youtube.com/watch?v=En2TzBE0lp4

http://www.haaretz.com/hasen/spages/1050688.html

On Wed, 03 Jun 2009 07:36:01 -0400, Frank wrote:

Thanks, but what is potting soil for if not for plants in the pots?

I was looking forward to your getting a variety of answers. I'm no
expert but I use potting soil for house plants and plain old cheapest
bagged topsoil for my container grown tomatoes, peppers, eggplants and
cucumbers.

While you can certainly grow all those plant using plain old topsoil in a
container, your plants will do much better with a properly structured
container mix. When I started gardening in containers I used topsoil and
for the most part things grew. Then one year we had a very hot summer
and bad drought and I had all kinds of problems with all my plants due to
what the plants grew in. The next Spring I researched what I could do to
improve the garden and ran across that article. After changing to that
mix my plants grow a lot better now and much more resilient to
environmental extremes.

I would suggest going to part 1 of that article (the link I pointed to was
part 8) and read the comments because there is a lot of technical
addendums there. I don't use the exact formula suggested in the article,
I settled on a modified version. Due to the size of my container garden
( 200 cu.ft.) and that it sits on top a 2 story roof, it is impractical
to replace all that mix every year. So I need to recycle mix from year to
year. My formula is:

2 parts pine bark fines (it has to be the very small pine bark mulch
which can be hard to find)
2 parts year old mix
1/2 part perlite
+ fertilizer (depends upon the plant this mix supports)

The pine bark and perlite provide structure to the mix so that it has lots
of air pockets for the roots to grow and breath, drainage so that water
doesn't pool and drown the roots, but not too much drainage so that it
dries out too fast after watering.

"AKT" wrote:
Thanks, but what is potting soil for if not for plants in the pots?

Potting soil is a mix, all soils are a mix... those labeled potting soil are
generally a lighter less dense mix that enable more air to reach the roots
in a confined space of a pot. But regardless, you can and should amend all
soils to best suit what's planted... you shouldn't use the same soil mix to
pot cacti and violets. And remember to repot often and use fresh soil.

brooklyn1 wrote:

: remember to repot often and use fresh soil.

Repot how often? Is the old soil good for anything, eg, as topsoil in
the lawn/garden, or should it be just discarded?

"AKT" wrote in message
...
brooklyn1 wrote:

: remember to repot often and use fresh soil.

Repot how often? Is the old soil good for anything, eg, as topsoil in
the lawn/garden, or should it be just discarded?

I use spent potting and seed raising mix on my lawn to patch parts of it
from time to time. I sieve out the big stuff and bung that on a garden and
then use the finer stuff to seed new grass in to. Works fine.

rob

"AKT" wrote:
brooklyn1 wrote:

: remember to repot often and use fresh soil.

Repot how often?

Depends how quickly the plant outgrows its pot, you do not want your plants
to become pot bound. My general rule is to repot once every 1-2 years...
the organic matter breaks down so the soil compacts.

Is the old soil good for anything, eg, as topsoil in
the lawn/garden, or should it be just discarded?

No matter where you discard spent potting soil it will end up as dirt
somewhere on the planet so you may as well sprinkle it in your yard.

"AKT" wrote in message
...
brooklyn1 wrote:

: remember to repot often and use fresh soil.

Repot how often? Is the old soil good for anything, eg, as topsoil in
the lawn/garden, or should it be just discarded?

I use spent potting soil mixtures to mix into my compost pile. Everything
here is recycled. Nothing is wasted that can go into the gardens.
--
Kelly..........
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