I have tried many things when it came to getting flowers on special occasions; even picking ones from my rose garden. Sugar and aspirin are the couple I did most often. With this I added a penny. I was never sure why, but my Grandma always did this so of course it was a good thing!
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I recently was reading a article in some magazine while waiting to go into the doctor appointment. I found a very interesting fact, today's pennies do not have enough copper in them to do anything as a helping fungicide. So if you do this helpful idea make sure your penny was made before 1981. Find one and keep it just for the bottom of you cut flowers. You'll be able to enjoy them so much longer. If cutting them from your yard, early morning is better, flowers are holding the moisture from the night before.
Source: Article at doctor's office from older magazine.