Poison ivy seed

Poison ivy seeds are seeds that can be grown with level 70 Farming. They are planted in  bush patches. These grow in two hours and forty minutes, yielding 674 experience points from checking the health, and 45 experience points per berry picked.

There is no need to pay a farmer to watch your poison ivy bush grow because "it is pretty hardy stuff, and most animals will avoid eating it." Additionally, poison ivy bushes will never become diseased, so compost and supercompost are unnecessary. A poison ivy bush yields 4  poison ivy berries, which will grow back eventually once picked.

Poison ivy seeds are dropped by:

Aberrant spectres

Cave horrors

Cyclopes

Dagannoths

Elf warriors

Giant rock crabs

Ice warriors

Kurasks

Moss Giants

Mountain trolls

Nechryaels

Ogres

Turoths

Waterfiends