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Lily of the valley
Convallaria Lily of The Valley has to be conditioned in a different way to other cut flowers:
On receipt, submerge the entire bunch under water for 1 hour in room temperature water. After, place in the fridge to crisp up for 6 hours before arranging in a vase. Before use in a bridal bouquet - hang upside down in the fridge for the last hour so that all the water is transferred to the flower heads. This will prevent premature wilting.