The answer is to be found in the environment that is created within the keyhole.
Where my future gardens will be is a hot place in summer and very cold in winter so I think that keyhole will create an environment in the soil that will create its own humidity and if its covered it may just be the Key ... pardon the pun.
A great blog to be found here to read regarding setting it up and the history of keyhole.
Images @ Eminpee Fotography
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