newb on Al's 5.1.1 mix
Hello all. I'm new to the garden and the GH which I recently built, and am planning on using pots in my GH. It will be all vege's right now except a banana and orange I will use the gritty mix on. I've read extensively on the forums and the information is never-ending. Still I have a few questions that I need help with. I'm planning on using the 5.1.1 mix but with some changes.
First I think I saw somewhere that Al said the peat could be substituted with compost. Now that could be wrong hence the question. I understand the problems with using compost in containers and have read the retention posts, just to clarify, but figured with the ratio it wouldn't be a problem.
I had also been contemplating using compost as a mulch on all plants, pros v cons(I am sure there are lots of both).
Lastly, you can laugh, but as a newcomer what is perlite? I here talk of toxic dust and also talks of replacing it with turface for more moisture. I don't think I'll need the moisture, but what about other alternatives, maybe like the crushed granite.
Thanks to you all and Al for all you do for others here. Your help and time is greatly appreciated.