Question
We want to arrange tall silk hydrangeas in a tall clear vase for a wedding.  We can't seem to keep it from toppling over.  We also want whatever is inside the vases to be pretty for viewing.

Answer
Hello.  I believe you had asked this previously... so it's great that you've provided enough information this time to get a more useful answer!

You'll need to use either hardening acrylic (it looks like water, but the stems are "cemented" in there.  Or perhaps glass beads.  Those would be your only really good choices for silks in glass.