The mix that Null and JB uses is an excellent one...but I prefer to use Al's Gritty mix...the main reason I use it is because it last a few years before it breaks down (3-4 years sometimes)....it lasts a lot longer for me. I'm lazy and don't like to repot unless necessary
. Another plus with this mix is you can tweak the ingredients a little...you can use a little more Turface if you have a plant that prefers a little more moisture or use a little more Grit or sand if you need less moisture (for Jades/Cactus/Succulents).
Equal parts, Turface, Pine Bark (fines), Grit or (coarse silica sand) and a dash of lime. You can also add a little Osmocote or Dynamite slow release fertilizer in the mix.
Crushed Granite (rinsed) to flush out the fine dust
Pine Bark (Fines) sifted to remove the dust
Turface (screened) to remove the fine particles.
Slow Release fertilizer
This is what the Finished Mix looks like...
Make sure you use a MASK...to stay safe so you don't inhale it...Very dusty and do it outside on a NON windy day.
For more info check out the Container Forum on GW...Tons of info there. There's always a ton of people to ask ??'s there that uses it. Good luck!