Should you blanch the stem ends of freshly cut flowers in boiling water before arranging them and what's the best way to keep cut flowers looking fresh?

I read that you should blanch the stem ends of freshly cut flowers in boiling water before arranging them. Why would you do that? Also, what's the best way to keep cut flowers looking fresh?
Submitted by BHGPhotoContest

Only the stem ends of plants with milky sap (such as butterfly weed and poppies) should be seared in a candle flame or dipped in boiling water soon after harvest. Heat seals the cut and prevents the sap from leaking out, making a mess in the vase, and inhibiting water uptake. Other flowers don't need that treatment.


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