Need help finding volcanic rock powder
I'm in BC (the eastern Interior of BC, but even sources in the Lower Mainland might work). My problem is, I had a 2.2 lb sample, and I don't have any more of it!
My story: This is the first year I've tried using volcanic rock powder as part of our seed starting mix. Volcanic rock that's been crushed to a fine brown powder. I was sent a kilogram by a fledgling company that seems to have gone dormant or belly-up.
I decided to experiment with jalapeno-pepper and Bonnie Best tomato seed plantings. I mixed the volcanic powder into the potting soil for some trays, at about 15% of the potting mix. And then I planted comparison trays without it. After using the same seed, the same light, the same watering procedure, the difference was unmistakable. The trays with the volcanic-powder amendment literally looked twice as good as the comparison trays. Leaves had better and more even colour, overall growth of the little seedlings was much better.
I want to buy at least a 20 kg sack (44 lbs) and use it in our small greenhouse. Any brand names? Sources?