Autumn Garden Maintenance Checklist for Cornwall

Autumn is the season most gardeners get wrong. Either they do too little — figuring the garden will sort itself out over winter — or they do too much, cutting everything back when they should be leaving well alone. In Cornwall especially, getting the timing right matters, because our autumn is not the same as the rest of the UK's.

Down here, growth genuinely continues into November. We rarely get a hard ground frost before December, and some winters barely see one at all. That means weeds keep spreading, moss keeps establishing on lawns, and algae keeps building up on paths and patios long after gardens further north have effectively shut down for the year. It also means you have more time to get things right — but that time has a limit, and by mid-October the window for many tasks starts to close.

Here's my working checklist for autumn garden maintenance in Cornwall. Work through it in roughly this order and you'll head into spring in a much better position.

1. Give the Lawn Its Final Cut of the Season

In Cornwall, the last meaningful mow of the year is usually in October or even early November — later than most gardening advice suggests. But when you do it, raise the blade height to around 4–5cm. Do not scalp the lawn going into winter.

Short grass going into the cold, damp months is vulnerable to frost damage, moss invasion and wear from foot traffic. A slightly longer sward insulates the roots and retains some resilience. You're not looking for a bowling green finish in October — you're preparing the lawn to survive and recover well in spring.

If the lawn has developed a thatch layer over the summer, autumn is also a good time for scarifying and aerating. This lets air and water get down to the roots, reduces waterlogging over winter, and sets the lawn up well for next year.

2. Clear Leaves Regularly

Leaves sound like a minor job, but on a lawn they're a real problem. A layer of wet leaves left over several weeks will smother the grass underneath, cutting off light and air. It creates the perfect damp, sheltered habitat for slugs, and it can block drainage — leading to waterlogged patches that take months to recover.

In Cornwall, the leaf fall tends to be later than much of the UK — often running through October and into November. The temptation is to wait until all the leaves have fallen and do one big clearance. Resist this: by that point the damage to the lawn underneath will already be done. A weekly or fortnightly rake or blow keeps things manageable and protects the grass.

Leaves can go on a compost heap or in your green bin. If you have a large garden with heavy leaf fall, a leaf blower and a tarpaulin for collecting and dragging is the most time-efficient approach.

3. Get the Hedges Trimmed Before October Ends

If you have hedges that need cutting, aim to have this done by the end of October at the latest. After that, you're into the dormant season — most hedges will be fine cut in winter, but the growth response in spring is better when the cut is made before the plant goes fully dormant.

Autumn cutting also tidies up the hedge before the worst of the winter weather. A well-shaped hedge sheds rain more effectively and is less prone to wind damage than one that's gone bushy and top-heavy over the growing season. I offer hedge cutting right through autumn, and October is one of my busiest months for it.

4. Cut Back Perennials — But Not All of Them

Herbaceous perennials — the plants in your borders that die back each year — should be cut back in autumn once the foliage has died off. This tidies the borders and removes potential overwintering sites for pests.

However, leave some seed heads standing. Echinacea, rudbeckia, teasel, fennel and many ornamental grasses look beautiful with frost on them, and their seed heads provide food for birds through the winter. This isn't just an aesthetic choice — it genuinely supports local wildlife. Cut them back in late February or early March instead.

Tender perennials that won't survive frost — dahlias, cannas, salvias — need lifting and storing in a frost-free place. In much of Cornwall mild winters mean you can sometimes get away with leaving dahlias in the ground with a thick mulch, but if you're further inland or at elevation, lift them to be safe.

5. Pressure Wash Paths and Patios

This one often gets left until spring — which is a mistake. Autumn is actually the best time to pressure wash hard surfaces, precisely because the wet winter ahead will keep spreading any algae or moss that's already established. Clean it off now before it builds up.

Algae and green slime on patios and paths is a serious slip hazard. A wet Cornish winter makes it worse. Getting the surfaces clean in September or October means you go into the most dangerous months — wet leaves, low light, icy mornings — with clean, safe surfaces underfoot.

I offer pressure washing across Cornwall and this is one of the most satisfying jobs to do in autumn. The transformation is immediate and it protects your surfaces as well as looking great.

6. Check Fencing and Garden Structures

Cornwall gets some serious storms. If you haven't checked your fencing, gates, garden sheds and pergolas since last winter, autumn is the time to do it — before the next round of storms arrives.

Look for posts that have rotted at the base, fence panels that are loose or bowing, gate hinges that are rusting, and trellis or pergola timbers that have started to split. A panel that's slightly wobbly in September may be flat on the ground by January. Small repairs now are far cheaper than emergency replacements in February.

7. Plant Spring Bulbs

October is the ideal window for planting daffodil, tulip, crocus, allium and hyacinth bulbs. They need a cold period in the ground to trigger flowering, and planting in October gives them exactly that. In Cornwall's mild climate, bulbs that aren't planted until November sometimes don't get quite enough cold to perform at their best.

Bulbs are one of the most rewarding things you can do in autumn — the work takes an hour or two and the payoff in March and April is enormous. Plant daffodils at around three times their own depth, in groups rather than single lines, and in well-drained soil. If your soil is heavy clay, add some grit to the planting hole to improve drainage.

8. Clear Gutters if You Have Overhanging Trees

If your house or outbuildings have gutters that run under or near trees, check and clear them in October. Leaf-blocked gutters overflow, and overflowing gutters send water down the side of your walls, into your foundations, and over your paths. In Cornwall's wet winters, a blocked gutter can cause real damage quickly.

This is a straightforward job with a ladder and a pair of gloves, but it's worth doing while the leaves are fresh and easy to scoop out rather than waiting until they've compacted into a wet mulch.

9. Drain and Store Garden Hoses

A hose left full of water and exposed to frost will split. Drain your hoses thoroughly, coil them loosely, and store them in a shed or garage for the winter. Same goes for any outdoor taps — if your property has exterior tap connections, check whether they have an isolation valve inside and turn it off for the winter.

It's also worth cleaning and oiling any garden tools before storage — spades, forks, hoes and trowels last far longer with a bit of basic care. Wipe off soil, rub down metal parts with an oiled cloth, and hang them up rather than leaving them on the floor where they can rust.

Why Doing This Now Pays Off in Spring

The gardeners who have the best springs are almost always the ones who used autumn well. When you come out in March to a lawn that went into winter at the right height, borders that were cut back and mulched, and paths that are clean and safe, you're building on solid foundations. The garden comes back quickly, and you're not spending your early spring catching up on the work you should have done in October.

If you'd like help with any of the tasks on this list — the lawn care, the hedge trim, the pressure washing, the clearance work — I'm covering Newquay and across Cornwall right through autumn. Get in touch and I'll come out for a free visit to see what needs doing.