What Is the Refrigerator Crisper Drawer For, and How Do You Use Its Humidity Control?

A crisper drawer is an enclosed compartment designed to maintain higher humidity than the rest of the refrigerator. Fruits and vegetables continue to respire after harvest, releasing water vapor that can build up in an enclosed space. A head of lettuce left on a shelf can wilt in dry air within a few hours, while the same lettuce can stay crisp for days in the crisper. The small slider in the drawer cover controls how much of that built-up moisture escapes; the drawer works as a storage tool together with its vent. In many homes, a crisper whose slider is never adjusted is only partly used.

With the slider closed, moisture stays inside, making this setting suitable for leafy greens: lettuce, spinach, parsley, Swiss chard, mint, and scallions spoil by losing moisture, not simply by drying out. Place greens in the drawer unwashed and with the bunch intact; wet leaves encourage mold to grow faster. A paper towel on the bottom of the drawer absorbs excess water and keeps the leaf surfaces dry, helping them last much longer at this setting. Replace the towel as it gets wet; once saturated, it no longer absorbs moisture and instead holds it.

With the slider open, air circulates through the drawer, making this setting suitable for fruits that release ripening gas. As apples, pears, apricots, peaches, and bananas ripen, they release this gas as well as excess moisture. In a closed drawer, both can build up, causing fruit to soften and grow mold sooner. In a ventilated drawer, the gas escapes, the surface stays dry, and the fruit ripens at its own pace. For the same reason, do not share this drawer with greens that are sensitive to the gas. One ripe apple in the drawer can shorten the life of all the greens beside it by days.

With a refrigerator that has only one drawer, you have to choose, and in most kitchens the right choice is to use it for greens: greens can lose quality in hours, not days, while fruit can also sit on the counter. In refrigerators with two drawers, the division is clear: use one with the vent closed for greens and the other with the vent open for fruit, and set it up once, keeping it that way. If the labels on the drawers wear off, a one-word note inside the cover prevents confusion. When more than one person puts groceries away, that note may be the only thing that keeps the settings from getting switched.

No matter how well the crisper is adjusted, water that collects at the bottom can undo the benefit. A single rotting leaf or split fruit can saturate the drawer with moisture and quickly spoil everything nearby, so empty and wipe the drawer weekly and remove any questionable item promptly. Overfilling the drawer can lead to the same result because crowded produce presses against itself, and bruised spots are the first to spoil. Filling the drawer to two-thirds capacity helps balance humidity as well as pressure.