Cunningham's Encyclopedia of Magical Herbs - Scott Cunningham 1985
Bluebell
The Herbs
(Campanula rotundifolia)
Folk Names: Harebell
Powers: Luck, Truth
Magical Uses: If you can turn a bluebell inside out without tearing or damaging it, you will eventually have the one you love.
The next time you see a bluebell, pick it and repeat the following words:
Bluebell, bluebell, bring me some luck before tomorrow night.
Slip it into your shoe to seal the spell.
Anyone who wears a bluebell is compelled to tell the truth in all matters.