Fleur's Grass Tiara is crafted with Magic Craft in Mabinogi. This page lists everything needed to make it, checked against the game as it exists today. The interactive planner lives in the Magic Craft Companion.
Recipe availability
Fleur's Grass Tiara is a rank 1 Magic Craft recipe with a best success rate of 60% at rank 1 and dan ranks.
Materials
Each craft uses
100× Fresh Grass — Dig flower patches near Emain Macha, Ceo Island, or Zardine with a Weeding Hoe.
20× Unfading Flower — Buy it from Fionnait's shop in Mag Mell for 100 Gold-Leaf Pine Cones.
20× Wisteria Decoration — Progress through Fleur's Mag Mell missions for a chance to receive it.
2× Fleur's Tearstone — Chance drop from Fleur or Kerune in Mag Mell missions on Hard difficulty.