There is a particular kind of guilt that comes with pulling a slimy bag of spinach out of the fridge drawer on a Thursday evening. It is not dramatic, but it nags. The good news is that cutting kitchen waste rarely requires a personality transplant or an expensive set of matching glass containers. It usually comes down to a handful of small, repeatable habits — and a little help from the things you already grow on your windowsill.

Start with what you already have

Before you buy anything, empty the fridge onto the worktop. Not a full deep clean — just a five-minute look at what is hiding at the back. You will almost certainly find a half-used lemon, a tired pepper and something in foil you cannot identify.

Give yourself a dedicated "eat me first" shelf at eye level, or a clear box in the door. Anything approaching its best goes there, and that is what you cook from. It sounds almost too simple, but visibility is the whole trick: most food waste is not a moral failing, it is an object permanence problem.

While you are at it, decant dry goods into jars you can see through. Clear containers make you use the lentils, and they look lovely on an open shelf, which is a happy side effect.

Plan loosely, not rigidly

Rigid meal plans collapse the moment life interferes. Instead, plan around three or four flexible meals with interchangeable parts: a grain, a protein, a sauce and whatever vegetables need using.

• Roast a tray of tired vegetables on Sunday; they become pasta, soup, frittata or a grain bowl.
• Keep a pot of soup or dal in the freezer in single portions for the nights you would otherwise order in.
• Shop twice a week rather than once if you can — smaller, more frequent buys waste less than a bulging weekly trolley.
• Write your list from the fridge outwards, not from a recipe book inwards.

Stale bread deserves a mention too. Blitz it into crumbs, tear it into a panzanella, or make croutons. A loaf that is past sandwiches is not past dinner.

Store food the way it actually wants to be stored

Most wasted food was doomed the moment it was put away. A few corrections make a real difference.

• Soft herbs — parsley, coriander, dill — last far longer as a bunch in a jar of water in the fridge door, with a loose bag over the top.
• Woody herbs — rosemary, thyme, sage — prefer a slightly damp cloth or a dampened tea towel in a box.
• Salad leaves keep crisp with a sheet of kitchen paper in the box to soak up condensation.
• Carrots and celery stay snappy in a sealed container with a little water, or wrapped in a damp cloth.
• Potatoes, onions and garlic want cool, dark and dry — and away from each other, as onions make potatoes sprout.
• Tomatoes belong on the worktop, not in the fridge, where the cold dulls them.
• Bread freezes beautifully, sliced, straight from the shop.

Keep your fridge a touch colder than you think it needs to be, and do not overcrowd it — air needs to move for anything to stay fresh.

Compost, even in a small flat

You do not need a garden to keep scraps out of landfill. A bokashi bin fits neatly under the sink and ferments everything, including cooked food, dairy and small bones. A wormery works on a balcony or in a shed, and gives you liquid feed that your houseplants will adore.

If your council collects food waste, use it — line a small caddy with newspaper rather than buying plastic bags, and empty it every couple of days to keep things sweet. A sprinkle of bicarbonate of soda in the bottom helps too.

For a windowsill, a sealed jar of water with citrus peel and a splash of vinegar makes a decent cleaning spray, so even the peel earns its keep before it goes.

Swap the disposables you use most

Do not overhaul your whole kitchen at once. Count what you throw away for a week, then replace the top two or three items.

• Beeswax wraps instead of cling film for cheese, half an avocado and bowl covers. They mould with the warmth of your hands and last about a year.
• Lidded jars for leftovers, sauces and overnight oats — the ones you already have from pasta sauce will do.
• Cloth produce bags and a couple of sturdy tote bags kept by the door.
• Silicone or fabric bowl covers, and a stack of old tea towels cut into cloths for wiping and draining.

Aluminium foil is genuinely recyclable if it is clean, so scrunch it into a ball before it goes in the bin rather than tossing a flat sheet.

Grow the scraps you would otherwise bin

This is where your kitchen meets your windowsill, and it is quietly addictive. Spring onion ends root in a glass of water in days. A lettuce or celery base will regrow leaves in a shallow dish. Basil and mint cuttings root happily in water before moving into small pots of compost.

A tray of microgreens on a bright sill gives you something fresh to snip into soup all winter, and a pot of parsley by the sink means you use it before it wilts. Growing even a little of your own food changes how you treat the rest of it. You notice the effort, and you waste less of it.

None of this needs to be perfect. Pick one shelf, one habit, one swap this week — and let the rest follow when it feels easy.