>>532377869
Just run in circles around this island, by the time you've made a circuit the first ones you picked will have respawned.

>>529899418
Just run in circles around this formation and pick up all the fibres as you pass them. By the time you've completed one circuit the first ones you picked will have respawned. Spend 10-20 minutes doing that and you'll be set for ages.

>>529163204
Here. Just run in circles around this island and pick up all the plant fibers, it'll be respawned by the time you reach a full circle.