the rack is a tin coated with plastic cloths drying rack , most were just on tables . the garlic in the pic was harvested 3 weeks ago and was trimmed up just before the pic . holding back water makes the roots come out cleaner so they cure and dry better . you just don't want to dig them and have a big clump of mud on them , maybe you don't even have clay there ,I don't know. always dig the garlic not pull , gently shake the heavy soil away and handle the garlic gently . all these things add to storage longevity . If you're only harvesting a few it's not a big deal because you'll use them before they go bad. if you harvest a lot you want to do all you can to get them to last as long as they can. if you wait too long to harvest they will burst open and not keep well at all . if any burst use those first.