Further recipes for encouraging moss to grow on plant pots and other items to help them blend in with the background as storage containers include mixing 1 part dried or fresh moss with 2 parts of plain yoghurt, buttermilk. Some people like to use an old or cheap blender, while others prefer to use their hands.
At the end of the process you should end up with a thick creamy liquid that is easy to paint or smear on the outside of an inverted concrete plant pot or similar and a few weeks in a shady and damp spot the moss should grow and make the inverted pot look like a mossy boulder. This sort of cache is best used near water or damp areas with lots of other moss covered rocks so it is inconspicuous.
Just remember to replace the 'boulder' carefully every time you use it so there are no tell-tale bare patches or scuffs around it to show it is anything other than part of the landscape.
