One of the simplest things you can do for your garden each year is mulch the soil. It improves structure, boosts nutrients, and sets you up for stronger, healthier plants. Here's our straightforward guide to doing it right this autumn.
What is mulching?
Mulching means covering your soil with a layer of material, usually something organic like garden compost, bark chippings or leaf mould, though decorative options like pebbles, slate or pea shingle work too.
It does a lot of heavy lifting for very little effort:
Blocks light from reaching weed seeds, so they can't germinate
Slows water loss through evaporation, helping plants cope in dry spells
Organic mulches also get pulled down into the soil over time by earthworms and other organisms. As they break down, they improve soil structure, helping heavy clay drain better and light soils hold onto moisture while adding nutrients that feed plant growth.
Types of mulch
Mulch falls into two camps: organic (compost, bark chips, manure, leafmould) and inorganic (slate, pebbles, shingle).
Organic options like well-rotted farmyard manure, garden compost and leaf mould are great for vegetable beds and perennial borders. Bark chips break down more slowly, and as they do, they draw a little nitrogen from the topsoil, so they suit deep-rooted plants like shrubs and trees better. They're also a solid weed suppressant, and because they last longer, you won't need to top them up as often.
Inorganic mulches like pea shingle, pebbles and slate won't improve your soil, but they still suppress weeds, reduce evaporation, and look good doing it.
How to mulch your soil
It's a simple job, best tackled in autumn or early spring, once plants have died back and you've got room to work.
- Mulch onto damp soil, never frozen - mulching frozen ground just traps the cold in for longer
- Clear the area first: weeds, fallen leaves, and any dead-back perennials
- Lay it on thick, at least 5cm/2in, without smothering the plants themselves. If you're short on mulch, cover one area properly rather than spreading it thin everywhere; you can work round the rest of the garden gradually
- Around shrubs and trees, leave a gap at the base so the mulch isn't touching the bark
Autumn is also a great time to refresh your borders and containers with seasonal colour. See our guide to planting autumn and winter bedding plants for ideas on choosing and planting seasonal bedding.
We stock a great range of mulches and soil conditioners at our garden centre in St. Albans to keep your garden in shape. Pop in and treat your soil this autumn!
