Verdra Fibers

is the first of the 5 available fibers in the game. It is used for tailoring and alchemy. Gathering verdra fibers can only level the player's Plant Gathering level up to a maximum of 101. The plants have a chance of dropping Essential Mana, Idyllic Leafs, Cochineal Beetles, Indigo Petals, Murex Snails, Saffron Stalks, or Purpurin Roots instead of the actual fibers.

Source
Dropped by monsters and plants from the following provinces:
 * Island of Dawn
 * Arcadia
 * Fey Forest
 * Oblivion Woods
 * Valley of Titans