There's a bit of sand already in my compost mix, which is a private blend made up by a local nursery. Were I to start with my own raw compost I would probably add a bit of coarse builders sand (NOT childrens play box sand) to it as well. My potting mix for daylilies is an offshoot of the famous Al's gritty mix which is highly recommended for cactus and succulents. That recipe calls for things such as Pumice, turfice, granite chips- things not readily available to me. Small aquarium gravel (sharp edged, not the rounded kind) was not only more easily obtainable, but filled the bill for daylilies as a permanent roughage element. It's taken me years to get the proportions adjusted on my daylily mix (which I still fiddle with every year), but it seems to be paying off. Some of my daylilies in smaller pots have been with me for 10 years now - and again, this mix is for the long haul, not just a year or two. But this is not to say that there is not more then one way to make a cake. If it works for you use it.............Maryl
