Step 1 - Talk to Edmund and he'll tell you he needs Garlic and Black Orchids. These are at the Barton Flower Shop.

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Step 2 - Take the items back to Edmund and receive your reward.

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Reward - User Image - Black Orchid Brooch
"A gorgeous Black Orchid brooch, courtesy of Edmund. Wearing this item shows that you're a friend to Edmund's cause."
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You can complete this quest 3 times.