King cup or Marsh marigold (Lus buí Bealtaine) Once established, Caltha palustris or commonly known as the King cup or Marsh marigold produces a mass of bright yellow flowers very early in the spring. After flowering in March and April most foliage will gradually die back as the flowers fade, but sometimes it has a second flowering later in the year. Loved by hoverflies, bees and butterflies when in flower later in the summer. Native to Ireland. Position: Full sun to part shadePlanting depth: Grows in the damp margin to 20cm (8’’) below water level.Growth rate: SlowFlowering Period: March & AprilHardiness: HardyHeight: 60cm (24") Spread: 60cm (24") Aquatic pot and compost variations Aquatic plants come in a variety of pot and compost variations that have different benefits for planting and growing. Mesh Pot (Aquatic Compost)Pot can be removed and plant can be planted directly into soil or margins above or below the water line. Pot and plant can also be placed directly into water to be container grown, but will still need repotting in time. Pot (Aquatic Compost)Pot must be removed and plant should be planted directly into soil or margins above or below the water line. Pot (Regular Compost)Pot must be removed and plant should be planted directly into soil or margins above the water line. Cannot be planted directly into soil below the water line.