Blooming Marvellous is an achievement that requires the player to grow some fungus in the Mort Myre Swamp using the Bloom option of either a blessed silver sickle or the Ivandis flail.
40 prayer points are required to cast the spell. Players can recharge their prayer points at the altar in the Nature Grotto after completion of the Nature Spirit quest.
Temple Trekking provides a short-cut to the Grotto as a reward.
- This achievement used to be a task prior to the release of the Achievements System on 18 April 2017.
- The name of this achievement likely refers to the signature catchphrase of the host of "Gardening Australia", Peter Cundall.