A root of the Magic tree is obtained with the Farming skill. Level 75 farmers may plant a magic seed in a Tree patch, and once the tree has grown, the farmer may use an axe to chop the tree down to a stump. As with all player-grown trees, if you do not use a spade to dig up the roots, the tree will re-spawn and can be cut down again. The farmer may then use a spade on the stump to dig up the tree roots, clearing the patch for another tree, and putting the Magic root into the farmer's inventory . As with all tree roots, magic roots may be used in a compost bin to make supercompost. However, magic roots may be spun into magic string (instead of crossbow string like other roots) by using the magic roots on a spinning wheel , which is a component to make an Amulet of nature. Magic roots are also a component in the Herblore skill to make Super strong anti-poison potions.
The fact that magic roots are the only roots not currently used in the Fletching skill may be evidence that a Dragon Crossbow will be released in the future, for which magic roots would have to be used for the Crossbow String.