Wormeries for beginners: siting, feeding and routine care

Illustration of a stackable tray wormery in a sheltered garden corner

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A wormery is useful when you produce regular small amounts of kitchen scraps. Start with a sheltered position, composting worms and modest feeds, then let the rate at which food disappears guide what you add next. The aim is healthy worms and finished compost, not a large volume of liquid from the drain.

Table of Contents

What a wormery is and which worms to use

A wormery usually has at least two compartments: a lower sump for liquid and an upper composting area. Single-compartment wormeries are also used. Use composting worms sold by a reputable wormery supplier, often called brandling, red or tiger worms. They live in decaying organic material. Do not collect deep-burrowing garden earthworms as a substitute.

Siting a wormery

Composting worms are most active in warm, moist conditions, ideally between 18–25°C. Activity noticeably declines below 10°C and above 30°C. Choose a shed or a sheltered area of the garden that avoids winter cold and summer heat. A wormery kept in a kitchen, utility room or on a balcony can work, but neglected wormeries sometimes produce odours, so consider ventilation and proximity to living areas.

Worms prefer a pH between 6.5 and 7.0 and well-ventilated conditions. They will not tolerate extreme acidity and dislike being waterlogged, because that restricts their air supply. Place the wormery on a level, stable surface, protected from direct sun and heavy rain, and where you can easily add scraps and drain liquid.

Feeding a wormery

For best results, add small amounts of waste often rather than large batches. Chop waste into smaller pieces so worms eat it faster. Place food on top of the compost or bury it in feeding pockets. If waste is not being eaten, stop feeding for a few days until worms work through the top layer. Avoid adding more waste than the worms can cope with.

What to add

Raw vegetables, except onions, shallots, leeks and garlic, which are best used in small amounts or cooked first
Cooked vegetables
All fruit, except citrus peel, which should be limited or preferably cooked before adding
Tea leaves or explicitly home-compostable tea bags, crushed eggshells, coffee grounds and small amounts of bread
Limited amounts of newspaper, shredded office paper and cardboard, but not glossy magazines
Small amounts of garden waste such as annual weeds, leaves and other soft green material

Fruit and vegetable scraps containing seeds may germinate in the wormery.

What to avoid

Dairy products, fat, grease, meat, fish and bones, which attract pests and flies
Larger quantities of tough leaves and woodier material, which slow the system down

If you have a lot of garden waste, run an ordinary compost heap alongside the wormery.

Routine care

Initial setup

Follow your supplier’s bedding and initial-feed instructions for the number of worms provided. The RHS describes moist bedding followed by worms and a limited covering of kitchen waste, then about a week to settle. Its layer depths are not a reason to bury a small starter population under more food than it can consume.

Moisture and aeration

Organic waste usually has a high moisture content. If the lid is kept on, dry conditions are unlikely. Add water only if the wormery appears dry. Occasionally fork the compost over gently with a hand fork to check that worms are present and healthy. An established wormery can be left without food for up to four weeks, but liquid may accumulate and needs draining to avoid waterlogging.

Draining liquid

Drain off liquid regularly, especially in warm weather or after adding wet scraps. The RHS suggests diluting collected wormery liquid at one part liquid to ten parts water for use as a feed. Its composition varies; it is not a standardised fertiliser, and collecting more liquid is not a goal of running a wormery.

Emptying and restarting

Wormeries are usually emptied when full, typically after 8 to 12 months. You must separate the worms before using the compost. Worms tend to congregate just below the top layer of food waste. Remove the top 20cm layer and use it to restart the wormery. Alternatively, on a warm dry day, spread the contents thinly on a polythene sheet, cover the centre with wet newspaper, and collect worms as they move to the cool moist compost. Many wormeries use stacking trays: the finished compost is in the bottom tray, which can be emptied and returned to the top, avoiding hand-sorting.

Common problems and fixes

Fruit flies: bury new waste in decomposed material or cover with damp newspaper. Do not use chemicals, as they can harm worms.

Smell from too much waste: remove excess or undigested food, wait until worms digest the top layer before adding more.

Smell from wetness: drain excess liquid, add shredded paper or card to absorb moisture and increase air circulation. Check worms are alive. Make sure drainage holes are clear.

If smell persists after correcting wetness and overfeeding, check conditions with the wormery supplier. Do not add lime routinely or use a smell alone as a pH test. Use a supplier-approved calcium-carbonate bedding conditioner only at the stated rate if acidity is confirmed; avoid caustic quicklime or hydrated lime.

Using worm compost and liquid

Mature worm compost can be used as a soil conditioner or a component of an appropriate potting mix, rather than assumed to be a complete growing medium by itself. Liquid from the sump is runoff from decomposing material, not a standardised feed or a sterile product. If using it, follow the dilution guidance above, apply to soil and avoid splashing edible leaves or fruit. Do not use foul-smelling liquid as a remedy for a struggling plant.

Choosing a wormery and worms

Wormeries and composting worms are available from mail order suppliers. Consider these types: stacking-tray wormery (check trays fit, drainage, tap), single-compartment wormery (check drainage and lid), composting worms (check species and quantity). Before buying, check lid fit, drainage holes, and material robustness for outdoor use.

Useful products for this job

The links below open Amazon UK product searches. Check the exact item, seller, current price and compatibility before buying.

Stacking-tray wormery: Makes compost removal easier because worms move upward through trays, reducing hand-sorting. Check that trays fit securely, have drainage holes, and that the base has a tap or sump for collecting liquid. Search Amazon for Stacking-tray wormery.
Single-compartment wormery: A simpler, often cheaper option for beginners with limited space. Check that it has adequate drainage holes and a secure lid to keep out rain and pests. Search Amazon for Single-compartment wormery.
Composting worms: Composting worms adapted to decaying organic matter are required; ordinary deep-burrowing earthworms are unsuitable. Confirm the supplier specifies the species and that the quantity is appropriate for your wormery size; follow supplier guidance on starting numbers. Search Amazon for Composting worms.

Related garden guides

Sources and further guidance

Guidance researched in September 2026. The feature image is an AI-generated illustration. Product guidance is based on published information, not hands-on testing.