The “Alum Powder” Rule That Keeps Hydrangea Bouquets Fresh for 2 Weeks

How to Prep Hydrangeas Before They Ever Hit the Vase

Strip lower leaves first

Any leaf sitting below the waterline has to go. This keeps the water cleaner and reduces rot, which helps how florists keep flowers fresh look less mysterious and more practical.

I leave a few upper leaves if they’re pretty, but not many. Too much foliage means more moisture loss.

Recut stems the right way

I recut each stem at an angle with a sharp blade right before it goes into water. That fresh cut gives the stem its best chance at good water uptake.

This is one of my non-negotiables for hydrangea conditioning. If I cut stems outside, I move fast so they don’t sit exposed to air too long.

Split, crush, or not?

People argue about this a lot. I don’t aggressively crush hydrangea stems because it can damage tissues and turn the vase cloudy faster.

A fresh sharp cut plus alum usually works better for me than mangling the stem. For woody stem flowers, cleaner is usually smarter.

Handle the blooms gently

Hydrangea heads bruise more easily than they look. I support them with one hand while working and avoid tossing them around like grocery-store roses.

And now comes the part everyone actually wants: the exact alum routine. Hit the next button below, because the method itself is super simple once the prep is done right.