I don’t understand why flowers last longer if you change the water every day but fall apart if they are left in a full vase of water from yesterday. Are they removing nutrients from the water?
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After sitting around for a few days bacteria will grow in the water which increases the acidity of the water. This is why adding teaspoon of bleach to the water will also increase the longevity of cut flowers. Tap water provided by a city (i.e. not well water) SHOULD only has trace amounts of nutrients.
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