Making Leaf Mould for a Free Soil Improver

By Preventing Damping Off in Seed Trays
Comments 35
18 Jul 2026

Making Leaf Mould for a Free Soil Improver

Why bother with leaf mould?

Every autumn, streets, parks, hedgerows and gardens across the UK give away a free soil improver by the sackful, and most of it ends up in the green bin or on a bonfire. Leaf mould is simply what happens when fallen leaves are left to break down slowly and coolly, rotted by fungi rather than the hot bacterial action of a compost heap. The result is a dark, crumbly, sweet-smelling material that opens up heavy clay, holds moisture in sandy soil and gives young plants a gentle start.

It costs nothing but a few hours in October and November, and unlike a compost heap it is almost impossible to get wrong. There is no careful balancing of greens and browns, no risk of the heap turning slimy, and no need to turn anything. Pile the leaves up, keep them damp, and wait.

Which leaves are worth collecting

Almost any deciduous leaf will rot down eventually, but they are not all equal.

Quick (about a year): lime, ash, cherry, horse chestnut, poplar and willow. These are thin and break down readily, giving a decent crumbly product in nine to twelve months.
Slow (18 months to two years): oak, beech, hornbeam, sycamore and sweet chestnut. Tougher and higher in tannins, but the wait is worth it — beech and oak leaf mould is superb stuff, especially for acid-lovers such as rhododendrons, camellias and blueberries.
Best dealt with separately: holly, laurel and conifer needles. Leathery, acidic and painfully slow. Shredding helps enormously, but if you only have a small amount, mix them into the ordinary compost heap instead.

Only collect from ground you have permission to use, and never strip a woodland or verge bare. Fallen leaves are habitat for hedgehogs, moths, beetles and frogs. Leave a generous layer under hedges and in quiet corners of the garden — the wildlife will thank you, and so will the blackbirds.

Collecting and storing: two easy methods

Timing matters. Wait for a dry spell after most of the leaves have fallen, so you are gathering crisp, light leaves rather than wet, matted ones. A spring-tined rake and a pair of gloves are all the kit you need, though a leaf grabber saves your back on gravel and lawn.

The bag method. Stuff damp leaves into old compost sacks or heavy-duty bin liners, punch half a dozen drainage holes in the bottom, tie the tops loosely and stack them behind the shed. Water them if the leaves were dry when bagged. This is the best option for a small garden or a balcony, because the bags take up almost no room and tuck neatly into a corner.

The bin or cage method. Make a simple cage from four stakes and a length of wire mesh, roughly a metre square and a metre tall, or use an old dustbin with the bottom removed. Fill it with leaves and tread them down firmly as you go — this stops them blowing about and speeds decomposition. Cover the top with a piece of old carpet or a scrap of tarpaulin weighted with bricks. Two or three cages let you have one batch rotting while the next one fills.

Whichever method you choose, a handful of grass clippings or a little soil scattered between layers gives the fungi a head start.

Speeding things up

Leaf mould is not a race, but a few tricks shorten the wait considerably. Run the lawnmower over a thick layer of leaves and collect the shredded result; smaller pieces rot far faster, and the mower mixes in a little grass to boot. Keep the pile as damp as a wrung-out sponge — check bags and cages during a dry winter and water them if needed. Turning is not essential, but forking a cage over once in spring introduces air and can knock months off the process. Keep containers out of full sun so they do not dry out.

When is it ready, and what to do with it

Leaf mould is ready when the leaves have lost all trace of shape and crumble easily in your hand. Expect a year for the soft leaves and two for oak and beech. If it is still recognisable as leaves, it simply needs longer — the pile rarely fails.

Use it in these ways:

Mulch: spread a 5cm layer around shrubs, perennials and fruit bushes in spring to suppress weeds and hold moisture.
Soil conditioner: fork it into the top few centimetres of vegetable beds and borders to improve structure.
Seed sowing: sieve it and mix with equal parts garden soil and grit for a free seed compost.
Lawn dressing: sieve it and scatter thinly over grass in autumn.
Containers: mix roughly one part leaf mould to two parts soil-based compost.

Store anything you do not use straight away in bags under cover, where it will keep for a year or more. A single mature oak can drop tens of thousands of leaves, so even a modest corner of the garden produces more of this stuff than you can use. Make a batch this autumn, and next year you will wonder why you ever put leaves in the bin.

Soil & Compost

Autumn Jobs for a Productive Garden Next Spring

Learn what to include, how to turn a heap, and when to spread finished compost so crops receive nutrients without weeds or pests.

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5 Comments

Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply
- John Abraham says Jul 21, 2024 at 10:00am
  
  I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
  Reply
  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply

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