Granular fertilizer keeps for years if it stays dry, so seal open bags in airtight bins and store them off the floor in a garage or shed. Liquid fertilizers and many liquid pesticides and herbicides can separate or lose strength if they freeze, so check each label and move anything marked "do not freeze" or "store above" a set temperature to a frost-free space. Keep every product in its original labeled container, locked away from children and pets, and away from heat, fuel, and pool chemicals.
Granular products
Granular lawn and garden fertilizers, lime, and gypsum do not spoil, but moisture turns them into hard clumps that clog spreaders. Close the bag tightly, then put it in a lidded plastic bin or a heavy contractor bag. Set bins on a shelf or pallet rather than a concrete floor, which wicks moisture. Clumped fertilizer can usually be broken up and used, though it may spread unevenly; crush lumps before loading the spreader. Our guide to broadcast spreaders for fall overseeding covers calibration.
Products combined with weed or insect control, such as weed and feed, carry an active ingredient that can lose strength over a few years. Check the label for any shelf life notes and use older product first.
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| Product | Freezing risk | Where to store |
|---|---|---|
| Granular fertilizer, lime, gypsum | None | Dry garage or shed, sealed bin |
| Liquid fertilizer concentrate | May separate or crystallize | Frost-free space |
| Liquid herbicide or insecticide | Varies; read the label | Per label, often above 40 degrees |
| Horticultural and dormant oils | May separate | Frost-free space |
| Ready-to-use spray bottles | Bottles can crack | Frost-free space |
If a liquid froze, let it thaw slowly and shake or stir it. If it stays separated, curdled, or crystallized, treat it as spoiled and dispose of it properly.
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Safety rules for storage
Garden chemicals are poisons and fertilizers can react with other products. These rules matter.
- Keep products in original containers with labels intact. The label carries the first aid and disposal directions. Never pour leftovers into food or drink bottles.
- Lock pesticides and herbicides away from children and pets, ideally in a locking cabinet up off the floor. Many pet poisonings come from chewed bags and bottles.
- Separate oxidizers and fuels. Store fertilizers and pool chlorine away from each other, away from gasoline, oil, and propane, and away from furnaces, water heaters, and other heat sources.
- Check for leaks before winter and set liquid containers in a tray that will catch drips.
- Keep a spill kit: cat litter or sand to absorb liquids, a dustpan, and a sealable bag.
- Wear chemical resistant gloves when handling, and wash hands afterward.
- Post the Poison Control number (1-800-222-1222 in the United States) near the cabinet. For pets, call your veterinarian or an animal poison control line.
Disposing of what you will not use
Do not pour pesticides, herbicides, or liquid fertilizer down drains, toilets, or storm sewers, and do not dump them on the ground. Take them to a household hazardous waste collection day or facility. Empty containers should be rinsed only as the label directs, then disposed of as it says.
An end-of-season routine
- Take inventory and write down what you have, so you do not buy duplicates in spring.
- Seal and bin granular products and get them off the floor.
- Move freeze-sensitive liquids to a basement or utility room, locked and labeled.
- Clean spreaders and sprayers before storing. See cleaning and sharpening garden tools before winter.
- Store leftover seed separately in cool, dry, rodent-proof containers; our guide to storing leftover garden seeds over winter explains how.
Bottom line
Keep granular fertilizer dry and off the floor, move freeze-sensitive liquids indoors, lock up pesticides in their original containers, and dispose of leftovers at a hazardous waste site. A tidy, locked shelf protects your kids, pets, and spring budget. For organizing the rest of the garage, read about wall-mounted garden tool organizers.
Related reading
- Rodent-proof bird seed storage
- Storing cordless yard tool batteries over winter
- Fall winterizer fertilizer for cool-season lawns
- Moss in the lawn: causes and control
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