American Horsetail Commonly known as American Horsetail, the stems are thicker than Equisetum hyemale, plus they are an attractive pink colour when young. Leave old growth standing through winter, cut down in spring when new shoots are about 15cm high. Ideal for adding a strong vertical element to ponds and water gardens, Equisetum robustum is vigorous & invasive and best grown in an aquatic basket to restrict its spread. Position: Full sun to part shadePlanting depth: Grow in the damp margin to 15 cm (6’’) below water level.Growth rate: MediumFlowering Period: June to AugustHardiness: Extremely HardySize:  Height: 120cm (48"). Spread: 30cm (12") (will spread if not contained) 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.