Simulating Italian Volcanic Soil - How?
I've taken it upon myself that I'm going to learn how to can tomatoes to make good italian sauces and nepoletano pizza. So i'm starting this year with growing several cultivars of San Marzano varieties to see what I like best. I'm trying for 6 different cultivars.
I have built some large planter boxes (8 x 4 x 2) and want to fill it with an appropriate soil for this tomatoes. San Marzano's are often described as being being grown in volcanic soil - specifically in the "shadow of mt vesuvius".
What is the best way to emulate this volcanic soil? I'm assuming the Volcanic part is Ash based, and not rock based. I've not have much luck looking online for italian soil information.. Any help is appriciated.