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How to make roses last longer
Start with a clean vase.
Before putting your roses on display, run your vase through the dishwasher or wash it thoroughly by hand with warm water and antibacterial soap. Using a clean container is important, as dirty vases often harbor germs and mineral and chemical deposits from tap water.
If you use the same vase regularly, get in the habit of scrubbing it out between uses. Make sure the inside of the container is spotless.