Quick answer

Clean your garden cushions before storing them, make sure they are completely dry, and keep them in a dry, ventilated spot over winter. For everyday care, brush off dirt, spot-clean spills quickly, and bring cushions indoors during heavy rain or prolonged damp spells. If you spot mildew, treat it immediately with a diluted vinegar solution and sunlight, then dry thoroughly before storage.

Daily habits that prevent bigger problems

Most cushion damage starts small: a bit of dirt, a splash of drink, or a damp evening left outside. Shake cushions after use to remove crumbs and debris. If food or drink spills, blot it straight away with a clean cloth and a little mild soap and water. Avoid scrubbing harshly, which can push stains deeper into the fabric. For removable covers, check the care label before washing; many can be gently machine washed, but always air dry rather than tumble dry to avoid shrinkage. Rotate cushions regularly so they wear evenly and don't develop flattened spots. If rain is forecast, bring cushions inside or store them in a waterproof box. Even brief showers can leave cushions damp for hours, creating the perfect conditions for mildew.

Deep cleaning before storage

Before putting cushions away for winter, give them a thorough clean. Remove covers if possible and wash according to the label. For non-removable cushions, vacuum both sides with a brush attachment to lift dust and pollen. For stains, mix a solution of equal parts white vinegar and water, apply with a cloth, and let it sit for a few minutes before rinsing. Never soak a cushion completely unless the manufacturer says it's safe. After cleaning, let cushions dry completely in a well-ventilated area, ideally outdoors in indirect sunlight. Sun can fade colours, so don't leave them out for days. Once dry, check seams and zips for any damage and repair before storing. A small tear can become a big problem over winter if mice or damp get in.

Where and how to store cushions for winter

Choose a storage spot that is dry, cool, and away from direct sunlight. A spare room, loft, or garage shelf works well if it's not damp. Avoid basements or sheds that get condensation. Use breathable storage bags or cotton pillowcases rather than plastic bags, which trap moisture and encourage mildew. If you must use plastic bins, line them with a cotton sheet and leave the lid slightly ajar for airflow. Store cushions flat or stacked loosely, not compressed, to keep their shape. Add a few silica gel packets to absorb any residual moisture. Before stacking, place a sheet of acid-free tissue paper between cushions to prevent colour transfer. Check on them once a month; if you notice any dampness or musty smell, air them out and dry again.

What to do if mildew appears

Mildew shows up as black, grey, or greenish spots and a musty smell. It thrives in damp, dark conditions. As soon as you spot it, take the cushion outside. Brush off loose spores, then apply a solution of one part white vinegar to three parts water. Let it sit for 15 minutes, then rinse with a clean damp cloth. For stubborn stains, a paste of baking soda and water can help. After treatment, dry the cushion completely in direct sunlight for several hours, turning it occasionally. Sunlight helps kill remaining spores and bleach stains. If mildew has penetrated deep into the filling or the smell persists after drying, the cushion may be beyond saving. In that case, replacing the cushion is safer than risking mould spreading to other fabrics or your health.

Diagnosing common garden cushion problems

  • Mildew spots and musty smell: Caused by prolonged dampness and poor airflow. Treat with diluted vinegar, dry in sunlight, and improve storage ventilation. If mildew returns after treatment, replace the cushion.
  • Faded colours: Caused by UV exposure. Rotate cushions regularly and store them out of direct sun when not in use. Severe fading cannot be reversed; consider replacing if appearance matters.
  • Flattened or lumpy filling: Caused by compression and moisture. Fluff cushions regularly and store them flat, not squashed. If filling is badly clumped, it may be time for a new cushion.
  • Torn seams or broken zips: Caused by wear and tear or overstuffing. Repair small tears promptly to prevent them growing. If the damage is extensive, replacement is more cost-effective than repair.

Products built for easy care and storage

  • Adeline Linen Cushion, Straw Stripe: Crafted from 100% linen for a soft, breathable feel, with a discreet zip closure at the back for easy removal. The removable cover makes cleaning simpler, and linen's breathability helps prevent moisture build-up.
  • Handwoven Cotton Mattress, Square, Black Gingham: Handwoven from 100% cotton and filled with recycled polyester, reversible with black gingham on one side and earthy red on the other. The cotton cover is durable and the polyester filling resists mildew better than natural fillings, making it a practical choice for garden use.