Which herbs are hardy?

[Rocketron]

Marjoram Growing and cultivation, How To Grow Marjoram and Oregano

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From the above link
Harvesting Oregano
Wild marjoram is best used as a dried herb - pick the leaves on a dry day and place them in a dark, dry and moderately warm place until they have thoroughly dried. They can then be stored in an airtight container as whole or crumbled leaves - they will retain their flavour for three months or more.

Is this why none of my dried herbs keep their flavour?
I have always dried them on a greenhouse shelf.
Sorry to hijack the thread.