Eco-Schools England

Carry on Composting is a Friend of Eco-Schools England  and supports the Eco-Schools aims, objectives and ethos. Visit Eco-Schools at

This page provides information and activities suitable for inclusion in classes and study sessions. Details of Composting at School including the regulations are given at Composting at School

The following pages provide additional infomation:

Compost Creatures   Compost Safari    Information on the cmini-beasts  that can be found in the compost heap of bin.

Making a Rotbot  Making a compost bin in a bottle so as to watch the composting process and then grow a bean in the compost

Composting methods,    Compost heaps   Wooden Compost bins  Plastic Compost Bins

Tumbler Composters   Wormeries    Information on different equipment and methods for composting garden waste

Composting Food  Composting food. Equipment and methods for composting food waste including cooked food.

Using Compost     Seed & Potting Mixes   How to use the compost made at school



Sessions for schools 1. Recyclable and Compostable Waste

This session will enable students to identify the appropriate disposal route for household and school waste and introduce composting as a means of processing organic waste at home and  school. It is recommended that this session is offered with the Lunch Box session.

 Students are asked to name items of waste produced at home and school. These  are listed on a whiteboard or flip chart as they are identified

 A PowerPoint introduction to waste produced at school including cooked food waste and identifying those materials that can be recycled can be included.

  • Students working as a class or in groups are asked which items could be recycled   followed by which of the recycled group are biodegradable.
  • Brief explanation of composting
  • Identification of   those biodegradable materials that can be composted e.g.  Food waste, paper, cardboard, garden waste.

 This can be followed by a Group session where waste materials are sorted into those that can be composted in compost bins, composted in wormeries, composted by the local authority, recycled and sent to landfill. 

This practical exercise can be undertaken using:

  • The Compost Game in which plastic fruit, vegetable, cooked food and other (clean) waste e.g. cardboard, paper, plastics and tins are sorted into separate containers.


  • Using picture cards in which pictures of the above materials are sorted onto display boards or mounted walls.


  • Using the lunch Box session chart shown in the picture

The whole class to come together to assess the results of the sorting exercise



Compost Game

Children sorting items that can be composted

Children are encouraged to sort a range of items, from (plastic) fruit and veg,  paper, bottles, sawdust, flowers etc into different disposal routes e.g compost, wormery, recyle, landfill.

They are then invited to separate the compostable material into "greens" and "browns". 

There are a number of similar exercises using pictures of the items but we have found tht younger children prefer to have items that they can handle and sometimes throw into the sorting boxes!

Sessions for schools 2. Lunch Box Session

  Processing waste from lunch

In this short session Students indentify which of the leftovers from their lunches, including any packaging; can be composted, recycled or sent to landfill on the “Lunch Waste Log” provided. This compliments the Compostable and Recyclable waste session but using the actual waste produced by the students. The ideal session will be short as it is hoped that there will be little waste

A spare log can be provided for completion at a school lunch or a family meal at home. These logs can be discussed at school. If it is decided to continue this exercise at school the waste could be collected in a kitchen caddy and weighed each day and a class total per week can be recorded as a part of a waste audit.

Waste Item




(normal compost bin)

Compost “Hot” composting or food composter

























 It is recommended that this session is offered with that on  Recyclable and Compostable Waste

Sessions for Schools 3. Compost Creatures and Safari

Fungus and ants nest in a compost bin

  Composting  recycles the nutrients that make plants (and animals) grow, feeds the bugs that keep the soil healthy and is a sustainable, low-cost way of dealing with organic waste  transforming it   into a valuable resource for the school or home  garden.

A compost heap isn't just a heap of dead stuff; it is a hotbed of biological activity.  One gram of compost can be home to literally millions of microscopic creatures.  The compost heap is a bit like a mini-beast nature reserve.

Our Compost Creatures and Safari session ( Compost Safari ) provides  children and interested adults in the East Midlands and the wider East Midlands with the opportunity to search compost from our compost bins and wormeries for the small creatures that help make and live in compost. The session also  includes a slide presentation, details of how to make a trap from plastic bottles and a quiz sheet  showing some of the  the creatures, from fruit flies to slow worms,  involved in the composting process or that might be found in a compost heap or bin.

For details of our availability and free sessions email

Check out the Garden Organic composting page at



Sessions for Schools 4: Making Compost

Hands on workshops.

During the composting process, microorganisms and soil creatures will turn organic materials into rich dark compost that returns valuable nutrients to the soil.  These sessions include a tour of the compost demonstration and the opportunity to make compost either in a bottle, which can be taken back to school, or using one of our compost bins

Brief introduction to practical composting. Importance of Air, Water, Browns and Greens to aerobic composting. Examination of samples compostable material and of finished compost

Making a Rotbot a "Compost bin in a Bottle" for details go to Making a Rotbot

Sessions for Schools 5: Making a Rotbot (Compost bin in a bottle)

Making a Rotbot  

 Rotbots allow students to watch and photograph the composting process over several weeks and then observe and record the growth of a plant in the compost they have created. We can provide a practical session for classes,  Eco Days  and other events etc

As this activity requires fresh "Green" waste e.g. grass and leaves it is normally only offered in the late spring, summer and early autumn.

 We include photos on this page. Detailed instructions are given on the Making a Rotbot elsewhere on the site  Making a Rotbot


  • Rotbot Compostable material added to bottle

    Compostable material added and allowed to compost for 4-6 weeks.
    the Rotbot is topped up as necessary. Soil is then added abd a seed sown.

  • Bean Seed Germinates

    The bean seed germinated. the Rotbot will now be transfered to the green house.

  • Bean growing well.

Sessions for schools 6. Filling a compost bin:

(This can be undertaken  on the demonstration  site or at the school).

This session is offered subject to compost materials being available.

Selection of materials for composting, if necessary cutting or tearing plant material into six-inch lengths.

Filling a convention or Rotary compost bin with layers of greens and browns.   Depending on the season, some materials, such as fallen leaves, from trees may be collected from designated areas of the gardens. Mixing the contents of bins using compost aerating tools and collecting sample from different levels in the bin.

Temperature recording from working compost bins. Assessing moisture content and harvesting finished compost

Session 7. Decomposition Rates in a Compost bin or wormery

 Compostable Garden and school organic waste : Different Rates of Decomposition

This experiment enables students to record the decomposition rate of different plant materials including “clean food waste” from their snacks and lunches e.g.  bananas and apples , a range of vegetables such as  carrot and parsley peelings (sections of  roots may also be used), vegetable tops /leaves, herbs and plant compost “activators” such as comfrey and nettle leaves.  In addition to these “Greens” and range of “Browns” such as corrugated cardboard, tubes from kitchen rolls, cabbage stalks, twigs a autumn leaves if available. If unable to collect freshly fallen leaves a local gardener should be able to provided leaves from the top of their current leaf mould container

Each of the chosen compostable material is placed in its own labelled poly mesh produce bags (these are usually made from knitted plastic and have a drawstring closure. Net bags are used by farmers, gardeners e.g. onion bags  (A 310mm wide x 350mm long net bags are  available new from Polybags at about £19 for 100) ..

Each food bag should be buried in a compost bin or wormery, with a length of string attached to the draw string and reaching up to the top of the compost bin so it can be retrieved to be examined weekly.  

The depth at which the bag is buried in the bin should be noted so that it can be returned to the same position once photographed

On removal from the bin the   contents of each bag should be emptied on to  a  white card  marked with the date  and photographed  to record  the rate of  decomposition .

The weekly examination should be continued until all the materials have been decomposed.


Session 8 Compostable and Biodegradable materials

This experiment enables students to record the decomposition rate of a range of products sold as Compostable and Biodegradable

Biodegradable materials will eventually be broken-down by bacteria or other living organisms, while "compostable" products will  decompose under  aerobic conditions with controlled temperature and humidity.

There are two types of compostable material. Most  compostable products should  to break down in 2-3 months in industrial facilities.  Home composting labels indicate that the material can be composted at the lower temperatures that occur in home composting bins.



Compostable bags are often sold to be placed in kitchen caddies  to collect kitchen scraps for composting. When full of kitchen waste the bag is then  carried to the compost bin  dropped in avoiding the mess that might be associated with using an unlined caddy. Compostable bags can also be purchased for picking up dog mess. Compostable Cling film is also available

Disposable Compostable plates, bowls, food and drink containers sold as  composted are designed to be composting in municipal composting facilities not cool home composting systems. 

If a Hot Home composting system e.g. Hotbin, Green Johanna, Jorra , is available the effectiveness of this bin should be compared with the more common cool composting systems.

Each of the chosen compostable materials is placed in its own labelled poly mesh produce bags (these are usually made from knitted plastic and have a drawstring closure. Net bags are used by farmers, gardeners e.g. onion bags  (A 310mm wide x 350mm long net bags are  available new from Polybags at about £19 for 100) .

Each food bag should be buried in a compost bin or wormery, with a length of string attached to the draw string and reaching up to the top of the compost bin so it can be retrieved to be examined weekly.  

The depth at which the bag is buried in the bin should be noted so that it can be returned to the same position once photographed

Each week the compost bin temperature should be recorded.  The  bag should be removed monthly and the   contents of each bag placed on white card,  marked with the date and  bin temperature,  and photographed  to record  the rate of  decomposition  and the effect on it by composting temperature. 

Sessions for Schools 9. Composting with worms (a)

Background session on worms

This session forms an introduction to the sessions on composting with worms providing basic  facts (five hearts, no teeth or eyes, breath through their skin,  should be kept moist and like the dark, reproduction). Link to Cleopatra.  Draw a  worm and  recognition of parts

Role of worms in the soil

Sessions for schools 10 . Worm Compost bins (b)

List the kitchen scraps that worms can eat and two that they should not be fed.

Carry out a Compost  Safari using compost from the worm bin  provided looking at worms and worm “eggs”

Environment necessary for keeping worms in a worm compost bin. Different types of bin- single chamber and stacking.

Harvesting the compost

Worm wee as a liquid fertiliser

Sessions for schools 11. The Wiggo Pod

 The Wiggo Pod is an is a commercial system that can be used when  teaching  the recycling of food waste  and plant growth from the compost formed using composting worms and seeds in a similar fashion to the Rotbot but the clever design of the Pod includes a self watering  system and a mini-greenhouse.

This session is only suitable for small groups or it can be added as a demonstration to the Rotbot session

 The Wiggo website includes support details and lesion plans


  • Pod with compost

    Wiggo Pod Day one.
    Compost and worms added

  • Apple added

    Apple added at the start of composting

  • Cover in place at the start of the composting process

    Composting in progress. the lid is in place to enable the composting process and worms to work in the dark

  • Apple composting

    Apple almost completely composted. Bean seeds to be planted.

  • Two bean seedlings starting to grow

    Bean seedlings surface

  • More to follow

    Seedling growing under the dome

Sessions for Schools 12. Making Seed and Potting compost

The session shows children and young people how to make peat-free Seed and Potting compost using compost from the school compost bin or brought to school from their bins at home.

Seed & Potting Mixes

Seeds are then planted and the growth monitored and compared with that of a similar seed plant in compost purchased from a garden centre.