How to Winter-Proof Your Garden: A November Checklist

November has a habit of arriving politely and then delivering a frost that catches everyone out. One morning the lawn is white, the dahlias have collapsed into black mush, and the tender plants you meant to move are still sitting in their pots by the back door. A few hours spread across a couple of weekends now will save you a small fortune in replacements next spring.

Winter-proofing is rarely about grand projects. It is mostly small, sensible jobs done in the right order, and the order matters more than the effort. What follows works from September through to the end of November, with the final weeks doing the heaviest lifting.

Clear up, but don't strip the garden bare

Tidy with a purpose. Rake leaves off the lawn and paths before they turn to slime, and bag them with a few holes punched in the sack to make leafmould for next year. Clear collapsed foliage from hostas, hardy geraniums and anything that has gone mushy, because wet debris is where slugs, snails and fungal problems overwinter.

Beyond that, leave things be. Seed heads on sedum, teasel, echinacea and ornamental grasses give structure through the grey months and feed the birds. Hollow stems and dense crowns are shelter for insects that will repay you by pollinating and eating pests in spring. A garden that looks slightly unkempt in January is usually a garden that works harder.

Protect the pots first

Roots in containers freeze far quicker than roots in open ground: there is less compost around them, and the cold reaches in from every side. Give your pots an afternoon's attention before the forecast turns.

1. Lift them off the ground. Stand each container on terracotta feet, bricks or tiles so the drainage hole is not sitting in a puddle. Frozen, saturated compost kills more container plants than cold air alone.
2. Group them together. Cluster pots against a house wall, ideally one facing south or west. Plants shelter one another, and the wall releases stored warmth overnight.
3. Wrap the pot, not the plant. Bubble wrap, hessian or an old blanket tied around terracotta and glazed containers stops them cracking and insulates the rootball. Leave the top open so air circulates and rain still reaches the compost.
4. Move the smallest containers. Alpines, herbs and young cuttings are happiest in a cold greenhouse, an unheated porch or a sheltered corner. Bring them in before frost is forecast, not the morning after.
5. Ease off the watering. Damp and cold does more damage than dry and cold. Water only when the compost feels dry a couple of inches down, and tip out saucers that fill with rain.

Move, mulch and wrap the tender plants

Borderline hardy plants need a decision, not a shrug. Agapanthus, pelargoniums, citrus, tree ferns and anything you carried home from a Mediterranean holiday will not shrug off minus eight. Lift what you can into pots and shelter; for those that must stay put, mulch 5–8cm of well-rotted manure or bark chippings over the root zone, keeping it clear of stems so nothing rots at the base.

Tree ferns want their crown packed with dry straw or bracken and the trunk wrapped in fleece. Banana plants can be wrapped in fleece or, if cut back hard, given a straw-stuffed collar. Use fleece or hessian rather than plastic sheeting, which traps moisture against foliage and encourages mould.

Dahlias and gladioli are worth lifting once the first frost blackens their leaves. Dry the tubers and corms somewhere airy for a week, then store them in boxes of dry compost in a frost-free shed or garage. Check them once a month and bin anything soft or mouldy before it spreads.

If you have tulip bulbs still in a paper bag, November is your moment. Planting them late reduces the risk of tulip fire, and they will still flower on schedule.

Give the lawn its last attention

Raise the cutting height for the final cuts of the year so you are only taking the top off, and only mow when the grass is dry and the ground is not frozen. Try to stay off a frosted lawn altogether: footprints bruise the blades and leave yellow patches that linger into spring.

Keep leaves off it. A layer left over winter smothers growth and invites disease. Fork or spike badly compacted areas, especially along paths and where children play, so water drains rather than pooling. If you feed at all now, choose an autumn or winter formulation low in nitrogen; a summer feed will push soft growth that frost will shred.

Trees, shrubs and the structures holding them

Winter gales do as much damage as hard frost. Walk the garden after a windy day and check tree ties for rubbing, loosening anything that has become tight around a swelling trunk. Firm in newly planted shrubs that have been rocked loose by wind, pressing the heel of your boot around the base.

Leave major pruning of plums, cherries and other stone fruits until summer, when wounds heal faster and the risk of silver leaf is lower. Check the supports on climbers, roses and wall shrubs, and make sure cloches, cold frames and lightweight covers are weighted down before the first storm rather than after it. Lifting a cold frame back off the lawn is a cold job in December.

Your month-by-month autumn checklist

• September: order bulbs and bare-root plants, clean and sharpen tools, wash out seed trays and pots, tidy the greenhouse and clip bubble wrap to the inside of the glass for insulation.
• October: lift dahlias and gladioli after the first light frost, move tender pots under cover, mulch borders while the soil is still workable, clear leaves weekly, and lag the outdoor tap.
• November: plant tulips, roses, hedging and fruit trees bare-root, wrap containers and tree fern trunks, drain hoses, check stakes and ties, and keep the lawn clear of debris.

The last week before the hard frost

Keep a frost kit by the back door: a roll of fleece, a few bamboo canes, some clothes pegs and a torch. Watch the forecast on clear, still evenings, because those are the nights frost arrives, and drape fleece over anything vulnerable before you go to bed. Move pots of bay, rosemary and parsley into shelter, and check that greenhouse vents are closed but not sealed tight.

Then make yourself a cup of tea and look at the garden from the window. Most of it will come through the winter without you. The handful of plants that matter most to you are now the ones you have done something about, and that is the whole point of a November checklist.

Photo: Boryslav Shoot / Pexels