I think he means decomposed granite, which is used as a base a lot for paths and driveways. It's basically like fine gravel so it drains very well. I don't have any knowledge of it being used in marijuana growing, but I think they use it in bonsai tree soils.The key to aerarion is porosity, this is why they use materials like expanded shale, lava rock, vermiculite, pertlite, pumus, etc...
Granite is dense and heavy and not very porus.
You're looking for light and airy.
That would be correct. Available in varying sizes know as "chicken grit" from you local feed storeI think he means decomposed granite, which is used as a base a lot for paths and driveways. It's basically like fine gravel so it drains very well. I don't have any knowledge of it being used in marijuana growing, but I think they use it in bonsai tree soils.
You seem to have taken care of that.Let's not be an idiot here.
The key to aerarion is porosity, this is why they use materials like expanded shale, lava rock, vermiculite, pertlite, pumus, etc...
Granite is dense and heavy and not very porus.
You're looking for light and airy.
On my land the natural soil is de-composed granite.
It is a LOT like concrete. Has a similar effect on seedlings.
Best use I've found for it ... Kitty Litter.
Excellent!
I know itll be heavy. Im gonna screen it at 1/8" and put the fines in my garden and use the 1/8"-3/8" pieces. Ive got super rich swamp soil and homemade castings. The swamp soil and castings are good on their own without extra drainage but Im thinking looooong term and I dont want it to eventually turn to clay muck. Ive used pumice and rice hulls before but wanted something I could get local here in fl and granite is easily available at landscape supply places. If its detrimental then I will use pea gravel instead as I know people have used it successfully in long term no till situations. I just thought granite would serve the same purpose and possibly leach some micronutrients into the soil over time.
This thread is about aeration not drainage, read my post I say rocks provide drainage, but porus materials provide drainage but they also provide aeration as in they hold pockets of air in the root zone.
The way I see things ... air trapped in yr porous material is there because of the action of water.
That is: the water you pour on, or rain, will displace any air. As the water drains out new air is then 'sucked' into the spaces thus 'aerating' the soil.
For example: I understand this process is one of the advantages of ebb and flow hydro setups because 'flooding' and subsequent rapid drainage (often thru fine gravel) carries lots of helpful oxygen to the roots.
There is an optimum size of gravel for this but don't know it off hand.