Do I really have to use vermiculite?
Now... for a question of my own...
I'm starting out with my first set of square foot gardens and I really don't want to have to use my precious, more valuable than gold, vermiculite in my mix. :rolls eyes: It's bad enough how quickly I go through the stuff growing portebellas which uses a 50/50 mixture of coco-coir and vermiculite as a substrate and if I could skimp on any one component of mel's mix, I'm hoping it could be this.
As far as everything else goes, I'm good to go, I've been doing my own composting for the last 1.5 years and have at least three yards of finished compost that's ready to use. Which, coincidentally, probably has about 10% vermiculite by volume as it is because I compost everything I can, including my used mushroom substrates. So nutritionally, it's about as diverse as it could be, I just don't know how absolutely essential to the success of the SFG the vermiculite will be.
Funny how non-compromising I can be on the requirements for my mushroom substrates and yet still try to be "cheap" on what I need for my garden outdoors. :shrug: