How to Farm Ranarr in RuneScape

Acquire a level 32 farming.

Travel to one of the herb patches. South of Falador North of Catherby North of East Ardougue Between Port Phasmatys and Canifis Trollheim (the only disease-free patch, available after the completion of the "My Arm's Big Adventure" quest)

Rake the patch. Allow your character to rake all the weeds out of the patch.

Add Supercompost to the patch. Supercompost achieves a higher successful yield and helps the item from plant disease.

Plant 1 ranarr seed. Use the seed from your inventory on the treated patch.

Harvest the herbs after 80 minutes of planting.