Ask your group to think about what theme they would like their garden to have. Perhaps it could be a fairy forest or Jurassic jungle? Or maybe it could link to their favourite book?
Have them sketch out some ideas onto paper to help them plan where things might go.
If you're carrying out this activity in a classroom setting, you could use SketchUp or CAD and link this activity to the DT curriculum.
Think about what plants your want to use to create your garden. Plug plants or cuttings with roots are great for adding instant colour. Herbs such as parsley, coriander or rosemary make great mini trees or shrubs and smell great. Grass seed or cat grass seed can create patches of lawn and will start growing in a few days.
Paper and pens for planning
A container such as a seed tray, fruit punnet or mushroom tray
Potting compost or soil
Plug plants, cuttings and/or seeds of your choice that fit your theme
Natural materials such as moss, pines cones and twigs
Items for extra structures or decoration such as modelling clay, bottle/jar lids, lollypop sticks, pebbles and gravel
Miniature figures or toys fitting the theme