| I have a wonderful book 'Culture of the Phal Orchid' by Bob Gordon (highly recommended!) and he has known reputable growers that challenged each other to grow in very peculiar medium. Two of the winners that were successful: broken glass and metal bottle caps! If it drains, supports the plant, and is watered to give the roots enough moisture - as in nature- I guess anything will work! Convenience was not one of the criteria....
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