An acorn is a seed which will grow into an oak tree once planted. Players must have at least level 15 Farming to plant it. Once grown, the resulting tree may be cut down using a hatchet to grant Woodcutting experience points and to gather oak logs. If a player does not dig up the stump, the tree will regrow. To dig up a stump, use a spade on it. Digging up the stump will yield oak roots and the tree patch will be cleared for growing another tree.
Acorns can be a surprising source of wealth, due to the oak roots resulting from digging up the tree. Unlike other common tree roots, which are usually dropped at first opportunity, oak roots can be used in brewing. If done correctly, players could make 90,828 coins per root if they manage to brew a keg of axeman's folly (m) at current prices.