A good friend of mines gave a 5 gallon bucket of it to me last year and it was used with other components and the trees ha e done better than i could have ever imagined. I need more for the upcoming season.
Mitch Alan Boatman southern Ohio USA GROWING ZONE 6
I was about to recommend http://www.digeronimoaggregates.com/ for Haydite, but then I read the description. The Haydite I purchase is made from calcined clay like Hydrock. The Haydite at the Ohio plant is made from shale. You may still want to check them out. It's hard for me to make an evaluation based on web photos.