H Y D R A N G E A S are the jazz. They are a tough shrub, and hands down one of my favourite plants. I recently moved into a new place, and what do you know, it came with a bunch of hydrangeas in the garden (whoop, whoop). As any normal person would do, I went gung-ho and cut some blooms and shoved them in a vase. After a day of having these beauties I noticed they became sad. They were all limp and if they could talk I'm pretty sure they would be whispering "I'm dying, help meeeeeee".
I became puzzled as previous hydrangea blooms have stayed fresh for way longer. I took to google and typed "helppppp me, hydrangea in vase dying after one day? What do I do?" BAM! The answer to my issue was simple, after cutting the blooms stick the cut end into boiling water. Sounds stoopid but I was willing to do anything to save those little flowers. After doing said "boiled water technique" it worked. Within a few hours my hydrangeas were all perky and good as new.
In a nut shell, sap gets caught in the steams and prevents the hydrangea from taking up water. So if you guys out there face the sad voices of little hydrangeas dying, then take my advice and re-cut the ends and stick them straight into boiling water. After 30 seconds place blooms into your vase with room temperature water. I also use this technique every time I cut a fresh bunch.
Best trick EVER!