Autumn is when container gardening either becomes self-sustaining or falls apart for another year. The difference usually comes down to preparation done in August and early September, before the nights turn reliably cold and the window for soil-warming and root establishment closes. This checklist covers what's worth doing before you put anything new into a pot.
- Empty and inspect all containers. Tip out tired summer compost and check the pot itself for cracks, degraded plastic or drainage holes that have silted up. It's much easier to replace a container now than after you've planted it up for winter.
- Refresh or replace the growing medium. Spent compost from a summer of heavy feeding is depleted. At minimum, mix in 30% fresh compost. For pots that grew tomatoes or courgettes, start fresh entirely - the disease load in spent tomato compost isn't worth carrying forward.
- Improve drainage. Add a layer of horticultural grit to the bottom of each pot before refilling. Autumn and winter waterlogging kills more container plants than frost does.
- Check drainage holes aren't blocked. A quick test: pour a litre of water in and watch whether it exits freely within thirty seconds. If it doesn't, the pot needs clearing or a new hole drilled.
- Assess your wind exposure. What was manageable in summer becomes brutal by October. Note which areas of your balcony or terrace are exposed and plan accordingly - not every autumn plant is wind-tolerant.
- Plan your windbreak if you haven't already. A simple willow hurdle, a trellis with evergreen climbers or even a large pot of ornamental grasses can reduce wind speed significantly and protect more tender plants placed behind it.
- Decide what you're actually growing. Autumn containers work best with a clear intention - winter salads, ornamental interest, bulbs for spring, or evergreen structure. Mixing purposes without planning usually produces a muddled result.
- Order bulbs before mid-September. The best tulip and allium stock sells out early. If you're planning a spring display from autumn-planted bulbs, order now rather than hoping garden centres have what you want in October.
- Check what's overwintering. Take stock of which tender perennials need bringing indoors or wrapping. Dahlias, cannas, fuchsias grown as standards - know what's staying outside and what needs protection before the first frost arrives.
- Tidy the structure, not just the plants. Clean support canes before storing. Wash old labels. Wipe down trellises and wall-fixing points. Five minutes per structure now saves frustration in February when you're trying to find things.
- Feed the soil, not the plant. A top-dressing of slow-release organic fertiliser or well-rotted compost applied now will break down over winter and be available to spring plants without you having to remember to do anything.
- Write down what worked and what didn't. A note on your phone is enough. Which varieties performed in your specific conditions, which containers held moisture well, which spot got scorched - this information is genuinely useful in February and almost impossible to recall accurately without a note.
"Autumn containers work best with a clear intention. Mixing purposes without planning usually produces a muddled result."
None of these twelve points requires specialist knowledge or expensive equipment. The payoff is that when you do plant your autumn containers - whether that's kale and violas, tulip bulbs or a structured arrangement of evergreens - you're putting plants into a system that's ready to support them rather than one that's quietly working against them.