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Flowers for ink: To make blue ink some European settlers used ground Delphinium flowers.

Clear water in the vase: If the water in the vase turns yellow and cloudy it is a natural sign that bacteria are growing in the water. Bacteria can clog stems and shorten the vase life of flowers, so keep the water clear at all times to ensure the longevity of your blooms. If your water starts to turn cloudy, immediately empty the vase and add fresh water, preferably mixed with the floral food provided by your florist. Re-cut the stems with a sharp knife under warm water before placing them in the vase of fresh water.