Hypericum Elodes is a Marsh St. Johns Wort, a mat-forming British wild native marginal pond plant with small, soft, yellow, saucer-shaped flowers.
These pond plants are best suited to the edge of streams, bog gardens and ponds in full sun and partial shade and are at a water depth of 0-2cm over the crown.
These will come in a 9cm plant pot and will need replanting.