So I've decided I'm DIYing my centerpieces, but I have no clue how many stems I actually need! The vase I'm using has a 4" diameter opening, and I want that to be essentially covered by flowers. One of the options I'm considering is doing a single hydrangea or peony since those are about 5 - 6" in diameter and would cover the vase, but I like the look of some other flowers like alstromeria or godetia.
I've tried researching this, but I keep finding the "it depends" answers. I know it depends on how full you want your vase to look and so on and so forth, but I feel like there has to be some kind of rule of thumb to follow on how bloom sizes vs the area you want to cover translates to how many you need...anyone know a magic trick for it short of just trial and error?