|Release||3 September 2018 (Update)|
|High alch||525 coins|
|Low alch||350 coins|
|Exchange||2,706 coins (info)|
|Examine||Plants grow especially fast thanks to this nutrient rich compost.|
A plant that has been treated with ultracompost has a 7% chance of dying, half that of supercompost, which has a 14% chance.
For herb and allotment patches, using ultracompost will increase the number of harvest lives by three (from a starting number of three lives). Every harvesting action will decrease the number of lives by one unless it is saved, with the patch becoming empty when it runs out of lives. This chance is dependent on Farming level and other boosts (magic secateurs, greenfingers aura, juju farming potion, master farmer outfit, etc).