Hoshi-imo can be preserved at room temperature; however, it easily gets mildewed because of its manufacturing method without using preservatives and other chemical products, in addition to the latest technique for preventing hoshi-imo from being over dehydrated, aiming at better texture.
室温保存も可能であるが、保存料等は使われておらず、さらに最近のものは食感を良くするため乾燥しすぎないようにしているのでカビが発生しやすい。