Container guide
Growing giant arrowhead in a pot
Compost and drainage
Giant Arrowhead likes steady moisture but not waterlogging — a tricky balance in a pot. Use a good peat-free compost with some added perlite for air, make sure the container drains freely, and mulch the surface to slow evaporation.
Watering giant arrowhead in a pot
Containers dry far faster than open ground, so giant arrowhead in a pot needs checking more often than the general guidance of "Permanently aquatic — plant in still or slow-moving water 10–15 cm (4–6 in) deep; tolerates up to 30 cm (12 in)." — especially in summer, wind, or a heated room. Check the top few centimetres with a finger rather than watering on a fixed day.
Potting on
Pot on when roots show through the drainage holes or growth slows noticeably — usually every 1-2 years for a plant this size. Move up one pot size only; jumping several sizes leaves wet compost the roots cannot reach, and that is what rots them.
More giant arrowhead care
Growing giant arrowhead in containers — FAQ
Can you grow giant arrowhead in a pot?
Yes — giant arrowhead does well in a pot. Aim for a container around 20-30 cm (8-12 in) across: enough root room for it to reach about 1.2 m, without so much spare compost that it stays soggy between waterings.
What size pot does giant arrowhead need?
Aim for a container 20-30 cm (8-12 in) across. Pot on when roots show through the drainage holes or growth slows noticeably — usually every 1-2 years for a plant this size. Move up one pot size only; jumping several sizes leaves wet compost the roots cannot reach, and that is what rots them.
What compost and drainage does giant arrowhead need in a container?
Giant Arrowhead likes steady moisture but not waterlogging — a tricky balance in a pot. Use a good peat-free compost with some added perlite for air, make sure the container drains freely, and mulch the surface to slow evaporation.
How often should I water giant arrowhead in a pot?
Containers dry far faster than open ground, so giant arrowhead in a pot needs checking more often than the general guidance of "Permanently aquatic — plant in still or slow-moving water 10–15 cm (4–6 in) deep; tolerates up to 30 cm (12 in)." — especially in summer, wind, or a heated room. Check the top few centimetres with a finger rather than watering on a fixed day.