I am chuckling right now Anna. You don't know how many times I get that response.
CRF: Control Release Fertilizer. As in those little round things you see in some of the Potting Mixes that already have fertilizer (Miracle Grow, etc.). You can buy it in packages to use in your garden or pots. Great stuff.
Sorry it is taking me so much time to answer your question, I am away from home until May 2. I will try to check in more often while away. I have found with my semps it is working better for pots if I use Potting Mix (MG, or comparable brand) with equal parts Turface and fir bark and chicken grit. After planting I top dress with the chicken grit. With semps you don't want to use much fertilizer as this can cause them to grow to fast and not do as well over all. They come from alpine areas, growing in gritty soil with little dirt, and usually pretty arid in summers. In Texas you might want to plant in a spot with morning sun, or filtered sun. All day sun might be to harsh with your Texas sun.
Are you planning on pots or in the ground?
