Spirit weed seeds can be planted in a herb patch in order to produce Grimy spirit weed herbs. This requires a Farming level of 36.
Spirit weed seeds can be obtained as a monster drop or cleaning out a bird's nest.
Planting spirit weed seeds are very profitable, therefore players are advised to make sure that the herb does not die. Supercompost (or Fertile Soil spell) is strongly recommended, as this is the best way of preventing your herbs from getting disease, as it is not possible to water the patch, or ask a farmer to tend the herbs. It takes 80 minutes to fully grow. It is highly recommended to use My Arm's herb patch, because he will protect your herbs from death for free, but you must first complete My Arm's Big Adventure. Those who want quick money from spirit weeds can make summoning potion or create spirit weed incense sticks.
The following table shows the profit yield, assuming all the herbs and seeds are purchased/sold at the Grand Exchange, for the guide price. If the herb dies, the loss will be -75,041 coins.
Supercompost yields a minimum of 5 herbs.
|Healthy Spirit weed plant
||The seed has only just been planted.
||The herb is now ankle height.
||The herb is now knee height.
||The herb is now mid-thigh height.
||The herb is fully grown and ready to harvest.
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- Unlike normal seeds which say "___ seed, for planting in a ____ patch" when examined, the spirit weed seed just says "a seed for spirit weed".