Living in Arizona it can be difficult to maintain proper moisture and aeration in planters but with these discs the problem has basically been solved. I like the fact that not as much soil is needed, the holes at the bottom allow for air and moisture to pass through slowly so root rot is not a problem. I'm able to keep a fairly consistent moisture level now so my plants are healthier and produce more blooms. I purchased these in 17 & 18" discs. I had a little bit of the problem in the beginning deciding which diameter disc would work best but I figured it out. I would definitely recommend.