Make a collection of materials to grow seeds in, such as hot drinks containers with lids - some are actually compostible. Find out what your collected cups are made of.
How can we be more environmentally friendly when buying take-away hot drinks?
Think about the requirements of a seed for growth and look at how well suited cups with lids are for this purpose.
Recycled 'hot drinks cups' and lids (preferably biodegradeable)