Setting the next column
CCHow To / Moderate
Clothes moth larvae eat keratin, and they prefer it with a side of sweat. Clean the sweater, fold it so it does not stretch, and put it in a container that actually closes. Cedar is a weak scent, not a force field.
The argumentSeasonal knitwear storage is a pest-and-shape problem, not a fragrance problem. Clothes moth larvae digest keratin in wool, cashmere, silk, and similar fibers, and they prefer soiled cloth; University of Kentucky extension says cleaning before storage kills eggs and larvae and removes perspiration odors that attract them. Fold knits so gravity does not stretch them, then use a tight container. Cedar and open-closet mothballs do not replace that sequence, and mothballs are EPA-regulated pesticides that belong only in airtight containers the label specifies.
I put sweaters away with cedar balls and still find holes in the spring. What actually works for storing wool and cashmere between seasons?
Clean first. Kentucky entomology: laundering or dry cleaning before long storage kills eggs and larvae and removes perspiration that attracts pests. Dirty wool in a pretty bag is still food.
Fold knits. Hanging a wet or heavy sweater stretches the shoulder and the knit. Support the garment flat or loosely folded.
A tight-fitting bag or rigid lidded bin is the physical barrier. Cedar oil may bother small larvae and does not stop an infestation; Florida extension is explicit that cedar has little effect on large larvae.
Mothballs are pesticides (naphthalene or paradichlorobenzene). NPIC/EPA: use only as the label says, in airtight containers, never in an open closet or a garbage bag that leaks vapor into the room.
The holes in a spring sweater are not a mystery of storage folklore. They are feeding damage from larvae that can digest keratin, the protein in wool, cashmere, silk, fur, and feathers. Adult clothes moths do not eat your clothes. Their young do, in the dark, on the garment you did not wear all summer, especially if that garment still smells faintly like you. University of Kentucky entomology is blunt about the sequence that actually works: clean the knit, then pack it in something that closes.
Cedar, lavender, and a spritz of 'fresh linen' do not complete that sequence. Fragrance can make a closet smell attended while larvae work in a folded cuff. Mothballs are a different category entirely: they are pesticides, and using them in an open wardrobe is both a health mistake and, in the United States, an off-label use of a registered product.
Kentucky's fact sheet is the household version of the biology. Larvae prefer dark, undisturbed places: closets, chests, boxes. Clothing and blankets in regular use are seldom infested. Cotton and polyester are rarely attacked unless they are blended with wool or heavily soiled. That last clause matters. A 'washable wool blend' that went into the bin with last winter's restaurant stain is still a meal.
Cleaning before storage does two jobs. It kills eggs and larvae that are already on the garment, and it removes perspiration odors that attract pests. Follow the care label: many merino and cashmere pieces can be washed gently and dried flat; structured or 'dry clean only' knits should be cleaned, not just aired on a hanger for an afternoon. Airing is not cleaning. If you can still smell last season's wear, a moth can find it too.
Shape is the other half of 'between seasons.' Knit fabric is a series of loops. Hang a heavy sweater by the shoulders for six months and the loops at the shoulder and upper chest elongate. Fold, or stack loosely on a shelf, with the heaviest pieces at the bottom. Tissue in the folds is optional; a hanger is not a storage system for a knit.
Look at cuffs, under collars, and along folds for holes, webbing, or granules. If you find active larvae, isolate the piece. Cleaning still comes first; do not pack an infestation into a 'protective' bag.
Launder or dry-clean per the label. This is the step Kentucky names for killing eggs and larvae and removing sweat. Let the knit dry fully. Damp wool in a bin is a mildew project.
Flat, with the garment supported. No hanger. No stuffing a damp sweater into a vacuum bag 'to save space' before it is dry.
Tight-fitting plastic bags or a rigid lidded bin. Kentucky's language is 'tight-fitting.' A cotton storage bag is breathable and is not a moth barrier.
A cool, dry, lived-in closet beats an attic. Check once mid-season if you can. Items in use are safer than items forgotten.
| Method | What it can do | What it cannot do |
|---|---|---|
| Wash or dry-clean, then a tight bin | Kill existing eggs/larvae (via cleaning) and block new adults from laying on the knit | Rescue a sweater that is already holed |
| Cedar chest, blocks, or hangers | Florida IFAS: oil may kill small larvae; a closed chest helps if the contents were clean | Stop large larvae; protect dirty knits; last forever as the oil fades |
| Lavender or 'fresh' sachets | Change how the closet smells | Kill eggs, larvae, or adults. Scent is not a pest treatment. |
| Mothballs in an open closet | Put pesticide vapor into the room you breathe | Legal or effective use. NPIC: labels require a tightly closed container. Open-closet use lets fumes escape. |
| Mothballs in a sealed chest, per label | Build up vapor that can kill moths in that sealed volume | A pleasant storage smell. Air the garments before wearing. Keep away from children and pets. |
Vacuum bags are a space tool, not a magic pest tool. If the knit is clean and dry, a bag that actually seals is a tight container in Kentucky's sense. If the bag's zip fails, or you vacuum a still-damp sweater, you have compression damage and a moisture problem. Do not treat 'vacuum sealed' as a substitute for the wash.
Carpet beetles eat the same keratin and are easy to blame on moths. Kentucky notes the mix-up. The storage advice is the same: clean, contain, do not leave animal-fiber goods undisturbed and dirty. Vacuum the closet floor and the edges of rugs. Larvae like lint.
If you skip one piece, that piece is the infestation starter.
Fold. Support. Do not stretch the shoulder.
Cedar is optional theater after the barrier exists.
Heat and humidity help pests and help wool smell stale.
Larvae want keratin plus soil. Cleaning is pest control, not optional freshness.
Fold knits. Hanging is how sweaters grow shoulders they did not have in April.
A tight container beats a scented closet. Mothballs are a pesticide with a legal use pattern, not a seasonal potpourri.
Worn once is soiled enough. Body oils are the attractant Kentucky names. Clean it, then store it.
They are lower risk unless blended with wool or filthy. They still stretch on hangers. Fold the heavy ones. You do not need moth protocol for a clean cotton tee, and you do need it for the merino blend in the same stack.
Clean everything in that storage group, vacuum the space, and inspect other animal-fiber goods (rugs, felt, wool coats). Repair is a darning or reweaving question. Storage going forward still starts with clean and contained, or the next season repeats.
Sources and further reading
Larvae digest keratin in animal fibers; cotton and synthetics rarely attacked unless blended or heavily soiled; clean before storage to kill eggs/larvae and remove perspiration; pack in tight-fitting plastic bags or containers; items in regular use are seldom infested.
Housekeeping and airtight storage as primary control; dry clean before storage; eastern red cedar oil kills only small larvae and has no effect on large clothes moth larvae; clothing bags and cedar chests protect only when materials are free of infestation.
Mothballs are EPA-regulated pesticides. Labels require tightly closed containers so fumes do not accumulate in living spaces. Use in non-airtight containers is a common, harmful mistake. Outdoor or off-label use is illegal and can harm people, pets, and the environment.
Continue reading
A care label is a legally required, tested minimum, not a suggestion. Federal rules dictate what it must cover, in what order, and require the manufacturer to have real test evidence behind every instruction on it.
Style / Care / 6 min
READ NEXTAbout the byline
Sources, review method, and commercial relationships appear with each story. Reach the desk at editorial@culturecolumn.com.