Supercompost is a more potent version of compost and is used in conjunction with the Farming skill. Compost, super compost, and ultra compost reduce the chance of a player's crops becoming diseased whilst growing to rates of 1/4, 1/8, and 1/10 respectively, as well as increasing the minimum number of crops that will be received by the player upon harvest, even if those crops are protected.

There are two methods to make supercompost. The first method is to place 15 suitable organic items (see below) into any of the compost bins that are located next to the allotment patches found around RuneScape. Once the suitable items have been added, and the lid of the compost bin closed, the contents will begin to rot, taking approximately 90 minutes until completion. During this time, the player may not open the compost bin or add any more items. Once the super compost has finished rotting, the player may open the compost bin and extract all of the super compost by using a bucket on it. Each bucket of super compost collected by the player will grant that player 8.5 Farming experience. When used on a farming patch, each bucket will grant an additional 26 experience. The second method is to use a Compost Potion on regular compost. Besides, a player can also use a compost potion on a filled compost bin containing regular compost to turn it into supercompost.

As a rule of thumb, supercompost should only be used on farming patches that produce a valuable harvest (such as high-level herbs) and/or provide significant experience for each item harvested (such as watermelons). Supercompost cannot increase the yield of trees, fruit trees, or bush patches. Therefore, it is not recommended to treat those patches with supercompost if you plan to pay a gardener to watch over them, since there is no benefit other than the extra 26 experience granted.

If the player has finished the quest Garden of Tranquillity or have enough points in Nightmare Zone, they can use a dose of compost potion to turn regular compost to supercompost either on bucket (1) or compost bin (15).

Supercompost can also be purchased with reward points from the Tithe Farm minigame, costing 5 points per bucket.

Players can add two volcanic ashes to a bucket of supercompost to obtain ultracompost, or put 25 volcanic ash in a full compost bin that contains supercompost.

Suitable items

Item Cost to Fill
Pineapple Pineapple 2,655
Watermelon Watermelon 285
Coconut Coconut 34,980
Papaya fruit Papaya fruit 6,570
Mushroom Mushroom 2,100
Poison ivy berries Poison ivy berries 1,260
Jangerberries Jangerberries 4,740
White berries White berries 4,650
Toadflax Toadflax 31,995
Avantoe Avantoe 30,810
Kwuarm Kwuarm 20,010
Snapdragon Snapdragon 147,270
Cadantine Cadantine 26,265
Lantadyme Lantadyme 24,210
Dwarf weed Dwarf weed 7,755
Torstol Torstol 120,525
Oak roots Oak roots 2,070
Willow roots Willow roots 810
Maple roots Maple roots 810
Yew roots Yew roots 1,095
Magic roots Magic roots 14,730
Calquat fruit Calquat fruit 1,020
White tree fruit White tree fruit Not sold

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