This are a dried, real product and with care, they will last forever.
They do have a tendency to shed if disturbed or in areas with a breeze. A strong hold hairspray can be applied if needed.
Each stem is unique and color/texture/height variation occurs.
Do not place in water.
The fluffier the pampas , the more likely they are to get a little squished during transport. Upon arrival, take them outside and shake lightly. Blow drying can be done to help re-fluff them.