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. However, spirit weed takes a long time to sell on Grand Exchange. Therefore, those who want quick money from spirit weeds can make summoning potion to get some quick money. However, this requires 41 Herblore and won't make much money as well as selling the spirit weeds.