Why a little autumn effort goes a long way

By the time October arrives, most of us are ready to hang up the trowel and retreat indoors. But the soil is still warm, the light is soft and mellow, and plants are quietly getting on with the important business of root growth. Everything you do now, before the ground hardens and the first frosts arrive, decides how your garden looks and feels next spring.

Think of autumn as the prep shift. You are not trying to make the garden beautiful right now — you are protecting the soil, feeding the soil life and tucking plants in for winter. Do that well, and spring will arrive with colour instead of chores. Here are the jobs worth prioritising while there is still warmth in the ground.

Clear fallen leaves — and turn them into gold

Leaves are the single most valuable free resource in an autumn garden, but they need moving. Left thickly on a lawn they smother the grass, encourage moss and give fungal disease a place to settle. Left on paths and steps, they become slippery hazards after rain.

Sweep or rake them up, then put them to work:

• Make leaf mould. Fill a bin bag or wire cage with damp leaves, punch a few holes for air, and leave it out of the way for a year or two. Oak, beech and hornbeam break down slowly; sycamore, lime and horse chestnut are much faster.
• Use it as mulch. A layer of part-rotted leaves around shrubs and perennials is a superb soil conditioner and costs nothing.
• Clear around roses specifically. Removing fallen rose leaves helps break the cycle of blackspot, which overwinters on the ground.
• Leave a few piles in quiet corners. Hedgehogs, frogs and toads will thank you for the shelter.

Mulch your borders before the cold sets in

Mulching is the closest thing to a magic trick in a small garden. A generous layer of well-rotted manure or garden compost, spread 5–8cm deep over damp soil, insulates roots against the freeze-thaw cycle, keeps moisture steady and suppresses weeds before they get a chance in spring.

There is a technique to it, though. Spread the mulch around plants but keep it clear of stems, trunks and crowns — piling it against the base of a shrub can cause rot. On heavy clay, fork over the surface gently first so the mulch can work its way in. Avoid mulching frozen or waterlogged ground, as it traps cold and wet where you least want them.

Not everything wants a rich blanket. Lavender, rosemary, thyme and alpine plants prefer poor, sharp drainage, so a gravel or grit top-dressing suits them far better than compost.

Plant spring bulbs — timing really matters

Bulbs are the heart of a small garden's spring, and they are astonishingly good value. The key is getting them into the ground at the right moment, because a bulb planted too late has less time to root before the cold.

• September to October: daffodils, crocus, snowdrops, grape hyacinths and alliums.
• November, even early December: tulips. They actually prefer a later start and are less prone to disease in cold soil.
• Depth: a good rule of thumb is three times the bulb's own height. Plant pointy end up, and if you cannot tell, plant it on its side — it will right itself.
• Layout: scatter bulbs by the handful and plant them where they land. Drifts look far more natural than neat rows.

In containers, try a "lasagne" planting: tulips deepest, then daffodils, then crocus on top, covered with grit. Use a loam-based compost, make sure there are drainage holes, and raise the pot onto feet so it never sits in a puddle. Squirrels are persistent thieves — lay chicken wire over the surface, or plant deeper than you think necessary.

If you are naturalising bulbs in lawn, lift the turf in flaps, plant, then press it back down. Mark the spot with a few short sticks so you do not slice through the bulbs with a spade in January.

Tidy, cut back and protect the tender things

Resist the urge to cut everything to the ground. Seedheads — teasels, sedums, coneflowers — feed birds through winter, and hollow stems make excellent insect hotels. A little untidiness is genuinely good wildlife gardening.

Do, however, handle these tasks:

• Shorten tall roses by about a third to prevent windrock, then prune properly in late winter.
• Cut autumn-fruiting raspberries right down to the ground once they have finished.
• Move tender pots to a sheltered wall and wrap them in fleece or bubble wrap. Insulate terracotta, which cracks in hard frost.
• Drain hosepipes, lag outdoor taps and clean your tools with an oily rag before storing them.

Feed the lawn, the soil and next year's beds

Give the lawn one last cut on a high setting, then an autumn feed low in nitrogen and higher in potassium to toughen it for winter. Aerate compacted patches with a fork and avoid walking on frosty grass, which bruises the blades.

In the vegetable patch, sow a green manure such as grazing rye, winter tares or field beans on any bare ground. It holds nutrients, stops winter rain washing goodness away and can be dug in next spring as free organic matter. Keep turning the compost heap, empty and scrub used pots with hot soapy water, and sharpen your secateurs.

Then make a cup of tea, order next year's seed and let the garden do its quiet winter work. Come March, you will be very glad you spent those crisp October afternoons outside.