Flax is a plant that can be picked. Players with level 10 Crafting can use the picked flax on a spinning wheel to create a bow string, granting 15 Crafting experience. It is possible to pick multiple flax from one plant. Flax can also be spun via the Spin Flax spell.

Flax can be found in various places:
, It is quite a useful item because once it is spun into a bow string, it can be used to string bows using Fletching, and bow strings sell for a fair bit. However, It is not very easy to sell flax for quick money, so players are advised to turn them into bow strings first to gain more money. It takes (with no armour equipped, and run turned on) approximately 75 seconds (non-stop) in Lumbridge Castle to spin an entire inventory of flax into bow strings.