So I looked it up on the internet, and it turns out, epsom salt is a great thing to use regularly on all your plants. Apparently, even Martha uses it. For more on using it for your plants (like why and how much), check out this and this.
I noticed that the epsom salt looks a lot like sand because it has big grains, not tiny ones like table salt. I always use this for my hurricanes. Much cheaper than buying pretty white sand.
I'm going to give some of them a try, and I'll let you know if it works.