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What should you do with fallen leaves?
Seasonal Gardening
What should you do with fallen leaves?
Fallen leaves do not all need the same treatment. Some can stay exactly where they are doing useful work. Some should be moved before they smother grass, block drains or turn the patio into a small autumn ice rink. The rest can be collected and turned into leaf mould or compost.
The Golden Rule for Fallen Leaves
The easy rule is this: leave leaves where they help, lift them where they cause problems, and reuse as many as you can.
Where fallen leaves can stay
- Under established hedges Leaves provide natural cover over bare soil under established hedges.
- Around mature shrubs Leaves slowly break down around mature shrubs.
- On bare soil in quieter borders Leaves shield undisturbed soil in borders.
- In quiet garden corners Leaves can rest undisturbed in tucked-away corners of the garden.
- Beneath trees Leaves can stay beneath trees where they do not smother smaller plants.
Keep the leaf layer light
The important word is light. A loose scattering is useful. A thick, wet blanket sitting on top of small plants is less helpful. If you can no longer see the plant underneath, it is probably time to move some of the leaves elsewhere.
Avoid piling leaves directly over low-growing plants, alpines, small evergreen plants or the crowns of perennials. Crowns are the central growing points at the base of plants. If they sit wet and covered for too long, the plant may struggle.
Where fallen leaves should be cleared
- Lawns Leaves must be cleared so grass can receive essential light and air.
- Paths and steps Clear paths and steps to prevent wet leaves from creating slippery hazards.
- Patios and driveways Clear hard surfaces before leaves compact into a soggy layer.
- Drains, gullies and gutters Keep drainage areas free of leaf blockages.
- Tops of small plants Remove leaves covering small plants to prevent smothering.
Why clearing is essential in key spots
A few scattered leaves on the lawn are not a disaster. A thick, wet layer is different. Grass still needs light and air, even in autumn. If leaves sit there for too long, they can leave the lawn weak, patchy and miserable-looking. Nobody needs a lawn with seasonal regret.
Paths, steps and patios are even more straightforward. Wet leaves can become slippery, so clear them before they compact into a soggy layer. It is not glamorous gardening, but it is better than discovering gravity beside the bins.
Drains and gutters are worth checking too. Leaves gather quickly in autumn, especially after wind or heavy rain, and blocked drainage can cause bigger problems than a messy border.
What to do with the leaves you collect
Once you have gathered the leaves, you have a few good options.
The best one, if you have space, is to make leaf mould. Leaf mould is made from decayed leaves. It is not the same as ordinary garden compost, which usually contains a mix of green and brown materials. Leaf mould is slower, simpler and very useful as a soil conditioner or mulch.
Three ways to make leaf mould
- Use a leaf mould bay A simple wire cage or open-sided bay works well if you have room.
- Use bags Fill strong bags with damp leaves, pierce a few air holes, tie them loosely and tuck them somewhere out of the way.
- Use the mower method If leaves are sitting on the lawn, collect them with a mower that has a grass box. This chops the leaves as it gathers them, helping them break down faster.
Caring for your leaf mould pile
Keep the leaves damp but not soaking. Then give them time. Most leaves take a long while to break down properly, often around two years. This is not a quick project. It is more of a “future you will be pleased” project.
Not all leaves break down at the same speed
Thin leaves usually break down faster. Tougher, thicker leaves take longer.
Leaves from oak, beech and hornbeam are commonly recommended for good leaf mould. Thicker leaves, such as sycamore, horse chestnut, walnut and sweet chestnut, are slower and are best shredded first.
Evergreen leaves, such as holly, cherry laurel and similar tough leaves, can also be slow. Shredding helps, and they may be better added to a mixed compost heap rather than left whole in a leaf mould pile.
Conifer needles can take even longer. Pine needles may produce a more acidic leaf mould, which is better kept for acid-loving plants such as camellias, rhododendrons, azaleas and blueberries.
The short version: if the leaves are big, leathery or waxy, chop them up before expecting much cooperation.
Can fallen leaves go in the brown bin?
Yes, light garden waste such as leaves can generally go in the brown bin in Ireland. This is useful if you have more leaves than you can sensibly store, or if your garden is too small for a leaf mould bay.
That said, if you have the space, keeping some leaves for leaf mould is well worth doing. It gives you a useful mulch or soil improver later, and it saves paying attention to the same leaves twice.
Do not put large branches, tree trunks or heavy woody material in the brown bin. For larger garden waste, check your local waste provider or civic amenity site.
What about street leaves?
Leaves from your own garden are the easiest to reuse.
Street leaves need more judgement. They may contain litter, grit, dog mess or other unwanted material. Leaves collected beside very busy roads may also be less suitable for garden use. If you are gathering leaves from outside your own garden, choose cleaner leaves from quieter areas and sort through them before adding them to a leaf mould pile.
When in doubt, leave them out.
A practical Dublin approach
In many Dublin gardens, the best approach is a mix.
Leave a modest layer under hedges and established shrubs. Clear the lawn, paths, steps and drains. Bag or bay the rest for leaf mould if you have room. Use the brown bin for overflow if you do not.
Small garden? Use bags.
Bigger garden? Set up a simple leaf bay.
No patience? Clear the problem areas and use the brown bin for the excess.
There is no prize for making autumn leaf clearing more complicated than it needs to be.
The simple checklist
- Leave leaves Under hedges, around mature shrubs and in quiet corners where they are not smothering plants.
- Collect leaves From lawns, paths, patios, steps, drains, gutters and small plants.
- Compost or make leaf mould From the leaves you gather, especially if you have space to store them.
- Shred tougher leaves So they break down faster.
- Use the brown bin For overflow or where home composting is not practical.
