If you are interested in doing this project as a group, please email the Earthworm Watch team on earthwormwatch@nhm.ac.uk for suggestions on how to run the project as a group activity.
There is also the option to print the Instruction Booklet and Earthworm and Soil Chart and source your own mustard and vinegar – instructions can be found here: http://earthwormwatch.org/get-involved
Earthworm Watch is a collaboration between Earthwatch Institute (Europe) and the Natural History Museum in London