What it's called pretty much depends on where you live. But generally, anything that is referred to as 'processsed', or 'class', or 'crushed', or 'road base' is a native mined mineral material (meaning it includes no organic soils, only mineral soils) that has been 'processed' by a crushing machine, after which it is 'processed' by a series of sieves to insure that all the particles are smaller than a certain size, and that only certain percentages of each size are within the makeup of the given finished product. For example, stone dust is a product of a stone crushing process and sieve filtering that eliminates all particles large than sand-like particles. A product known generally as 'crusher-run' is a product from the same process, but it is allowed to have greater percentages of certain larger particles. Products referred to as crushed or processed 'gravels' are just that...mined gravels (sand and stone mixtures, not just stone) that have been crushed and sieve filtered to certain specified percentages of this or that size particle.

Consider the size of the top dressing to go with the size of the plant and pot. The smaller the gravel and if strained for size will make the plant pop out. (show up better) White gravel is never considered for show plants. We don't want the gravel to take over the attention of the judges for show. I often use a large size to hold in the plant until the roots tap down solid, this is really ugly, most small crassula in 3-4 " pots I put through a size strainer so all of the gravel is the same size. It does make a difference. Try it you may like it. I am also a gravel snob. I prefer tan color, no green or blue, pink or yellow, I like natural colors. Norma

With the rockdust. Around here I would order "2A modified", enough to put down at least a four inch compacted layer. You need the 'fines', or smaller stuff, mixed in with your larger rock to compact and lock together the rock. Washed, or 'clean' has all the fine stuff removed, and won't lock together when compacted. 2A modified is also called 'roadbase' because it is used to build roads. Top it off with an inch or two of concrete sand or stone dust. Not play sand. This is the bedding layer for the stone, then you can sweep play sand between them when done.

Hi Adrien, I do think you’ll get some of the DG inside and on your floors, and will scratch. Probably not the best idea with kids. Adults who are sorta careful is iffy. And I’m not entirely happy with it, to be honest. I’d probably get rock if I had to do it again. Good luck!