Pecan nut processing companies generate mounds of the cracked shells, and usually these are piled high and allowed to age. N ratio materials. For example, the pecan shells are visible in the finished mulch. I'm not sure what process Garden-Ville employs. I'm sure there are variations in different locations.
Pecan shells are an excellent mulch for acid-loving plants like azaleas.
Honor Heights Park in Muskogee, Oklahoma, is famous for its azalea display of dozens and dozens of acres. This azalea park was established in the early 1960s by a pioneer horticulturist. The nutrient analysis for pecan shells is fairly low, actually. The nutrient value of pecan shells is therefore nothing to get excited about. The reason the mulch is valued is because it helps maintain moisture, provides organic matter, and enhances the acidity of the root environment for azaleas and blueberry's.