Container guide
Growing watermint in a pot
Compost and drainage
Watermint 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 watermint in a pot
Containers dry far faster than open ground, so watermint in a pot needs checking more often than the general guidance of "Constantly; keep the soil saturated or grow in standing water up to a few centimetres deep" — 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 watermint care
Growing watermint in containers — FAQ
Can you grow watermint in a pot?
Watermint is well suited to container growing — at about 90 cm mature it is comfortably pot-sized. A container around 15-20 cm (6-8 in) across gives it room without leaving the compost sitting wet, which is the usual mistake when people over-pot a small plant.
What size pot does watermint need?
Aim for a container 15-20 cm (6-8 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 watermint need in a container?
Watermint 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 watermint in a pot?
Containers dry far faster than open ground, so watermint in a pot needs checking more often than the general guidance of "Constantly; keep the soil saturated or grow in standing water up to a few centimetres deep" — especially in summer, wind, or a heated room. Check the top few centimetres with a finger rather than watering on a fixed day.