You will probably want... lets see here...
Rosemance, the Habiscus flowers from one of the NPCs, old vday hair pin, orchid hairpin, orchid petals, there's a few christmas trees, some grass, some clovers, golden harvest, spring glade, a whole ton of bouquets, baka senpai, and those are just the ones I can think of.
Oh and the petal paradise shop :3
All good, many of us bought the simple items