There’s always one morning in September when I step outside with my coffee and the air has that particular bite to it — not cold exactly, but a warning. That’s the morning I start walking the garden with a notebook, working out which pots are living on borrowed time.
Not everything in a cottage garden needs rescuing before the cold comes. Hardy perennials in the borders can simply be left to die back and do their thing. But the pots — especially anything tender that spent the summer looking glorious on the patio — are a different story. Pelargoniums, fuchsias, tender salvias, agapanthus, even a favourite fig in a terracotta pot: these are the plants that came from warmer places, or were bred from plants that did, and a hard frost can undo an entire summer’s growth in one night.
Know your date, not just your thermometer
The trap most of us fall into is waiting for a frost warning and then scrambling. By then you’re moving plants in the dark with cold fingers, and something always gets left behind. Instead, work backwards from your area’s average first frost date — for most of the UK and much of continental Europe, that’s somewhere between late September and mid-October, but it varies enormously by region and even by garden (a sheltered courtyard will lag weeks behind an exposed hillside plot). Whatever your date is, start moving tender plants in the two weeks before it, not the night of.
Which plants actually need to come in
Not every container needs the same treatment. I sort mine into three groups:
Full rescue, indoors for the winter — pelargoniums, fuchsias, tender salvias, citrus, and anything you paid dearly for at a specialist nursery. These want a cool, bright spot: an unheated porch, a greenhouse, or a windowsill in a room that doesn’t get too warm. Too much heat indoors is often more damaging than a light frost outdoors, because it forces soft, weak growth that then rots.
Cut back and store dormant — dahlias, cannas, and other tender bulbs and tubers can be lifted once the foliage has blackened with the first light frost, dried off, and stored in barely damp compost somewhere frost-free and dark. This isn’t a September job so much as an October one, but it’s worth deciding now where they’ll spend the winter.
Leave out, but protect — many tender plants are hardier than their reputation. A well-established fig in a large pot, for instance, often just needs its container wrapped in fleece or hessian and moved against a sheltered wall, rather than hauled indoors entirely.
The move itself
Before anything comes inside, give it a proper check — tip the pot slightly and look for slugs, snails and vine weevil grubs hiding in the compost, and give the foliage a gentle shake or a lukewarm hose-down to dislodge anything hitching a ride. Nothing ruins a windowsill faster than bringing the whole garden’s pest population indoors with the plant.
Trim back any leggy growth by about a third — it reduces the leaf area the plant has to support just as light levels are dropping, and it means less mess if anything does react badly to the move. Water sparingly once indoors; a plant that’s just been repotted mentally (if not literally) needs far less water than it did outside in full sun.
A note on pots themselves
If you’re consolidating several summer containers into fewer pots for winter, this is also the moment to check your terracotta for hairline cracks — a pot that survives summer perfectly well can fail once frozen, as damp compost expands inside it. A sturdy, well-made pot is worth the investment precisely for moments like this; ours are in the Planters & Pots picks if you need a reliable one before the cold sets in.
By the time the first proper frost silvers the lawn, my patio always looks a little bare — but the porch and greenhouse are crowded with everything that mattered, quietly waiting out the winter for next year’s summer border. It’s not a glamorous job, but it’s one of those small, practical rituals that makes the whole garden feel cared for.
