Woad leaves can be grown by members at level 25 Farming by planting a woad seed in a Flower Patch. Three woad leaves can be harvested from a flower patch at a time. Alternatively, players can buy up to 10,000 woad leaves, per transaction, from Wyson the gardener in Falador Park, at 25 coins each.
Due to being cheap, stackable and easy to acquire in bulk from Wyson, they make an excellent source of flowery mush for feeding animals at the player-owned farm. Players may also fill the beehives at the player-owned farm with woad leaves to create medicinal honeycomb. Players can take 2 woad leaves and 5 coins to Aggie or Rana the dyer to make blue dye.
Five woad leaves appear on the ingredient list given by Leslie during the second task of The Need for Mead event. They are the only required items on the list to complete the task where the cook in Lumbridge makes some rich mush for Leslie's bees out of them.
Woad leaves can be harvested from woad seeds grown within a flower Patch. A fully grown woad plant can grow 3 woad leaves at a time. All 3 woad leaves are harvested when picked, yielding 115 Farming experience.
Use default Talk and select 2. Ask about woad leaves. Then select 4. How about 20 coins? which provides the best value, since he actually gives 2 for being so generous, costing 10 coins per leaf.
A quicker alternative is using the right-click buy-X option, costing 25 coins per leaf.
In real-life medieval Europe (which RuneScape takes some inspiration from), woad was indeed used to make blue dye.[1] However, blue would have been an expensive colour, and was the "royal" colour of France.[2]
Upon release of the Player-owned farm, woad leaves jumped in price on the Grand Exchange to over 700 coins, but then the option to buy up to 10000 leaves at once was added, and the price settled to close to the buy price (25 coins).
^Amanda Greaves. Medieval Dyeing. Buckingham's Retinue Reenactment. 9 March 2005. (Archived from the original on 27 April 2005.) "Believe it or not, bright blue is one of the most likely candidates for a ‘rich’ colour. It was the most expensive colour in painting, and although blue dye from the woad plant (Isatis tinctoria) was actually one of the basic and most commonly-used dyes, it required something like nine months of processing work, which included fermentation."