Thorns
From A Wiki in the Desert
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Thorns can be gathered from certain Thorn-Bearing Plants. Harvesting gives a random amount from 1 to 96(+) thorns. After harvesting, there is a wait of 40? seconds before the same plant can be harvested for thorns again.
Once you have learned the Arthropodology skill, each gather from a Thorn bush may generate a crop-dwelling insect.