The Mixx from SBI Materials is a special soil blend that gives you total control of your growth and profit. The Mixx is a great start to finish the base soil for your planting needs. This blend is designed and lab tested for optimum growing output, while being neutral enough to add whatever additives and/or fertilizers you want. Like all of our soils, it’s local – it’s custom – it’s tested and it’s proven to help with all of your growing needs. We have created and designed this mix specially for tomato plants.