Growing salvia × sylvestris 'blauhügel' in a pot

Salvia × sylvestris 'Blauhügel' is well suited to container growing — at about 50 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.

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.

Salvia × sylvestris 'Blauhügel' 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.

Containers dry far faster than open ground, so salvia × sylvestris 'blauhügel' in a pot needs checking more often than the general guidance of "When top 3-5 cm of soil is dry, roughly every 7-10 days once established" — especially in summer, wind, or a heated room. Check the top few centimetres with a finger rather than watering on a fixed day.