Any use azomite in there potting soil.
I looked this up and it sounds like a great soil additive. I've never used it, though. I use soil-free potting materials and instead depend on inorganic fertilizers with micronutrients. But this is because I mostly have succulents that need very little or no fertilizer anyway and using compost, for example, will ultimately drown them.
If you're going to use it, tell us how it works out!
I read on its web page to mix 1 teaspoon per 2 inch pot diameter with potting soil before planting. Then to give 1 teaspoon quarterly thereafter.....So far it's working out so far...