No such thing.

Here is why:

Containers aren't the ground.

It is that simple.

You could take the most fertile, compost enriched soil and fill up a container with it and you know what you get? A royal pain in the butt to weed and water.

A medium that doesn't give good aeration.

Sure, that soil would have good biology and nutrients, at least initially, but the super small soil volume and lack of soil food web in such a small space would quickly run out of steam.

The small soil volume in a container simply cannot support organics in the sense of great soil growing great plants.

If you wish to grow a fruit tree in a container then what you want is a mix that will last until you have to repot. This requires an *inorganic mix*. Compost is the best stuff on the planet, but you know what it has in common with every other thing that is organic? It's volume shrinks as various visible and invisible critters eat it.

Fill up a pot with compost this year and next year your 'soil' volume is 4" low. Not good for something you wanted to leave in place for a few years.

If you want to be organic in container culture then use an inorganic mix for long term plantings and feed with organics like fish emulsion for nitrogen and seaweed emulsion for the micros and various rock powders for the P and K. Alternately get a bag of preformulated organic fertilizer and cover all bases. This works fine.

The mix itself though should last as long as it needs to before growth mandates repotting at which point you can restart a new mix.

Organic mixes = crap for containers.

I am an organic gardener.

I certainly find nothing to disagree with in the preceding reply. It's really cool that I'm now seeing continual mention from people about aeration, soil collapse, and related physical properties. I'm not around as much as I used to be & everyone keeps stealing the thunder. ;o) I wouldn't have posted anything much different - good advice.

I can help you build a suitable soil if you wish. Just let me know.

Al

Wow, thanks guy's, sound's really good.