The main point of Roderika’s entire questline is to unlock the ability for her to upgrade your Summons.

Both types of Glovewort are generally found in underground areas and/or near the presence of death.

Grave Glovewort will upgrade regular Spirit Ashes, while Ghost Glovewort will upgrade Elite Spirit Ashes.

Elden Ring player summoning a pack of Spirit Ash allies using the Spirit Calling Bell

Just like Smithing Stones, you’ve got the option to find Glovewort at different levels.

Each level of Glovewort can be used to strengthen Summons up to a certain level.

See the below tables for full details.

Part of the Elden Ring map of Stormhill and Stormveil Castle, with the locations of Roderika and the Chrysalid’s Memento highlighted in yellow.