Why Every UK Garden Needs a Compost Heap
Compost is often called 'black gold' by gardeners — and for good reason. A well-made compost heap transforms kitchen scraps and garden waste into a rich, crumbly soil improver that feeds plants, improves soil structure, retains moisture, and supports a thriving ecosystem of soil organisms. It's free, it reduces household waste, and it's one of the most sustainable things a gardener can do.
Yet many gardeners are put off by the perceived complexity of composting. The truth is, composting is remarkably forgiving — nature does most of the work. This guide covers everything you need to know to get started and make great compost consistently.
Choosing a Compost Bin or Heap
You don't need anything fancy to compost successfully — a simple open heap in a corner of the garden will work. But a dedicated compost bin speeds up the process, keeps things tidy, and retains heat more effectively.
Plastic Compost Bins
The most common choice for UK gardens. Lidded plastic bins retain heat and moisture well, are relatively inexpensive, and are often available at a discount through local council schemes. They're best suited to smaller quantities of material and work well for kitchen waste.
Wooden Compost Bays
A slatted wooden bay (or a series of bays) is the preferred choice for larger gardens producing more material. A three-bay system is ideal: one bay for fresh material, one for material that's breaking down, and one for finished compost ready to use. Wooden bays allow better airflow than plastic bins.
Tumbler Composters
A rotating drum composter speeds up the composting process by making it easy to turn the contents regularly. They're particularly good for kitchen waste and can produce finished compost in as little as 4–6 weeks. They're more expensive than static bins but are a good choice if speed is a priority.
Open Heaps
Simply pile material in a corner and let it rot down. Slower than a contained system, but perfectly effective for garden waste like prunings, leaves, and grass clippings. Cover with old carpet or cardboard to retain heat and moisture.
Where to Position Your Compost Bin
- Place on bare soil (not concrete or paving) so worms and soil organisms can access the heap from below
- Choose a spot with some sun to help generate heat, but not full scorching sun which can dry the heap out
- Make it accessible — you'll be visiting it regularly, so don't put it at the far end of the garden
- Allow space to work around it for turning and removing finished compost
The Golden Rule: Greens and Browns
Successful composting comes down to balancing two types of material:
Greens (Nitrogen-Rich)
Greens provide nitrogen, which feeds the microorganisms that break down the compost. They tend to be moist and soft:
- Grass clippings
- Vegetable and fruit peelings
- Tea bags and coffee grounds
- Fresh plant trimmings and weeds (not seeding)
- Chicken manure and other animal manures
Browns (Carbon-Rich)
Browns provide carbon and create the structure that allows air to circulate through the heap. They tend to be dry and woody:
- Cardboard and paper (torn into pieces)
- Autumn leaves
- Straw and hay
- Woody prunings (shredded or broken up)
- Egg boxes and toilet roll tubes
- Wood chip
The Right Balance
Aim for roughly equal volumes of greens and browns — about 50:50 by volume. Too many greens and the heap becomes slimy and smelly; too many browns and it breaks down very slowly. If your heap smells, add more browns. If it's not breaking down, add more greens.
What NOT to Compost
- Cooked food and meat — attracts rats and other pests
- Dairy products — same issue
- Diseased plant material — disease can survive the composting process and spread when you use the compost
- Perennial weed roots — bindweed, couch grass, and ground elder will regrow from roots; bin these instead
- Seeding weeds — unless your heap gets very hot, seeds will survive and spread
- Cat and dog faeces — can contain harmful pathogens
- Glossy paper and magazines — breaks down very slowly and may contain harmful inks
How to Build a Great Compost Heap
Think of your compost heap like a lasagne — layer greens and browns alternately for the best results:
- Start with a layer of coarse browns (twigs, wood chip) to allow airflow at the base
- Add a layer of greens (kitchen scraps, grass clippings)
- Add a layer of browns (cardboard, leaves)
- Repeat, keeping layers roughly equal
- Water if the heap seems dry — it should feel like a wrung-out sponge
- Cover to retain heat and moisture
You don't need to be too precise — just keep adding material and roughly balancing greens and browns as you go.
Speeding Up Composting
A cold, slow heap will eventually produce compost, but these steps will speed things up significantly:
- Turn the heap regularly — every 2–4 weeks, mix the contents to introduce oxygen. This is the single most effective way to speed up composting
- Chop or shred material — smaller pieces have more surface area and break down faster; shred woody prunings and tear cardboard into pieces
- Keep it moist — the heap should be damp but not waterlogged; water in dry weather
- Add a compost activator — a handful of fresh grass clippings, chicken manure, or a proprietary activator introduces nitrogen and microorganisms to kick-start the process
- Insulate in winter — wrap the bin in old carpet or bubble wrap to maintain heat through cold months
How Long Does Composting Take?
This varies enormously depending on the method, materials, and how actively you manage the heap:
- Hot composting (actively managed, turned regularly): 6–12 weeks
- Standard bin composting: 6–12 months
- Cold heap (left to its own devices): 1–2 years
Finished compost is dark brown, crumbly, and smells earthy — like a woodland floor. You shouldn't be able to identify the original materials.
How to Use Your Compost
Homemade compost is incredibly versatile:
- Soil improver — dig into beds in autumn or spring to improve structure and fertility
- Mulch — spread a 5cm layer around plants to retain moisture and suppress weeds
- Potting mix ingredient — mix with topsoil and grit for a homemade potting compost (not suitable for seeds on its own)
- Lawn top dressing — sieve finely and apply to lawns after scarifying to improve soil structure
- Raised bed filling — mix with topsoil to create a rich growing medium
Leaf Mould: The Slow Composter's Secret
Autumn leaves are too carbon-rich to compost quickly in a standard heap, but they make superb leaf mould when composted separately. Simply pile leaves into a wire cage or black bin bags (with holes for airflow) and leave for 1–2 years. The result is a fantastic soil conditioner and mulch, beloved by woodland plants and worms alike.
Shop Composting Equipment at Selections
Find everything you need to start composting in our range of compost bins and tumblers for turning and using your compost. Start making black gold today.