I think it is no secret I love flowers. I enjoy growing them, I certainly appreciate receiving them, and more often than I should on my way home from work I'll swing by the floral department in the grocery store and pick up a bunch or 2. Kroger has some shockingly good deals on flowers and I just can't pass those up.
1. When I cut hydrangeas as home I will dip their stems in Alum to help keep them fresh. I have found this to be quite easy.
2. I will dip their stems into boiling water for about 60 seconds to help the water flow up the stem.
Generally I have found the thinner stemmed hydrangeas that I cut from my own yard does not have much of the sap in their stems and my tips above work just fine. But, with my Kroger bunch I cut of maybe 3" of the stem, and dipped in alum and popped them in a vase. Next day the flowers had wilted. I took to the internet to try a new technique to revive them. They were sad, just take a look at 'em.