Planters that have no means of drainage control leave a mess. Issues with Ceramic Planters. Large ceramic planters have some of the same drawbacks as cement, although thinner walls make them lighter and more fragile, at least they do not have steel at the core.
So getting right to it then, what type of foundation are we going to build for our flagstone patio: sand, cement, or gravel?. Short answer: well it depends. Quarry screenings (if available in your area) are generally best for under the flagstones.