There is a particular window, right as August tips into September, when a London garden either gets ahead of the season or spends the next six weeks looking a bit sorry for itself.
The light’s generous, the soil’s still workable, and you’ve got just enough warm weekends left to make a few small fixes before everything slows down. None of these jobs take a full day. Most take an hour, maybe two, spread across a Saturday.
Tidy Up Your Borders One Last Time
Summer growth gets messy fast, and by late August most borders have a fair number of dead flowerheads sitting where fresh growth used to be. Deadheading spent blooms does two things: it immediately tidies the look, and it often coaxes out one more flush before the season properly turns. Roses, dahlias, and cosmos all respond well to a firm pass with the secateurs.
While you’re in there, pull whatever’s crept in over summer. Weeds left through August seed themselves by October, and a ten-minute pull now saves a much bigger job in spring. Cut back anything that’s gone leggy or collapsed under its own weight, particularly if it’s shading out plants you actually want to keep going into autumn.
It is also worth a quick check on anything you planted earlier in the year that’s clearly outgrown its spot. Late August is a reasonable window to move or divide perennials before the ground cools too much for roots to settle, and it saves you doing the same job under worse conditions in a few months.
Get the Lawn Sorted While Growth Slows
Grass growth starts to ease off as the days shorten, making this a natural point to give the lawn a more deliberate late-summer cut. Raise the blade slightly from your summer setting, tidy the edges properly, and clear any long or clumped clippings that could smother the grass underneath.
This is also a sensible moment to look at bare patches or thin spots that summer traffic has worn in. Overseeding now, while the soil still holds some warmth, gives grass seed a better chance to establish before growth slows for winter than waiting until spring.
If you’re the sort of household where the mower gets wheeled out, forgotten about, then rediscovered three weeks overdue, a smart self-driving lawn mower solves that particular pattern.
One option is Segway Navimow. Its wire-free models use virtual boundary mapping and can handle regular cutting on a set schedule, which matters more in a small London garden where a slightly overgrown patch is obvious within days rather than weeks.
It is less about the big seasonal jobs and more about keeping the lawn from getting away from you in between them, which is often the actual problem for gardens that only get attention at the weekend.
Check On Your Pots and Containers
Container plants take more of a beating over summer than anything in the ground, mostly because they dry out faster and get less root room to work with. Late August is a good moment to check what’s actually thriving and what’s quietly given up. Anything leggy or exhausted can come out now, freeing the pot for something that’ll carry you into autumn.
Top up compost where it’s dropped, and consider whether pots need moving. Spots that were perfect for summer sun can be too exposed once the weather turns, so shifting anything delicate somewhere more sheltered now saves problems later. If you’re restocking, The Boma Garden Centre in Kentish Town has a strong range of seasonal bedding plants and architectural varieties that suit the smaller borders and containers typical of a London backyard.
Do check drainage while you’re at it. Pots that have coped fine through a dry summer can waterlog quickly once autumn rain sets in, so make sure holes aren’t blocked and consider raising containers slightly on pot feet if they’ve been sitting flush against paving.
Give Furniture and Outdoor Fabrics Some Care
Cushions, throws, and anything fabric-based have usually had a rough few months of sun, spills, and the occasional unexpected shower. Before storing them or leaving them out for another few weeks, give everything a proper clean and a full dry. Damp fabric packed away for autumn is how you end up with mildew by October.
Wooden furniture benefits from a wipe-down and a check for any spots where the finish has worn through. Metal pieces are worth a quick once-over for rust starting at joints or screws.
It’s worth doing this properly rather than rushing it, since furniture left out through a damp autumn without any care is usually what needs replacing by spring rather than just cleaning.
Plant Something for Early Autumn Colour
The garden doesn’t have to go quiet just because summer’s ending. Bulbs planted now, things like nerines or autumn crocus, reward you in a matter of weeks rather than making you wait until spring. Late-flowering perennials such as asters or Japanese anemones also settle in well at this point in the year and carry colour through September and into October.
Even a balcony or a couple of window boxes can hold onto some life through the shift in seasons with the right choices. Homegirl London’s balcony beautification guide has useful ideas for keeping a small outdoor space looking more considered than forgotten, which apply just as much to the autumn stretch as they do to peak summer.
Ornamental grasses are worth considering too if you want structure that holds through autumn without much upkeep. They catch the low autumn light well and don’t need the same attention as flowering plants once established.
Most of these jobs aren’t urgent individually, but doing them together over a weekend makes a real difference to how the garden carries into autumn. Skip them, and you’re usually looking at a bigger clean-up job once the weather properly turns. Better to spend a few hours now while it’s still warm enough to enjoy being out there.
This article is a paid guest contribution. The views and information expressed are those of the contributor and not of Homegirl London.