Growing Bethlehem sage in a pot

Pulmonaria saccharata is a low-maintenance perennial once established, but consistent moisture is key to success. Water regularly during dry spells, especially in spring and summer, as the foliage will wilt and scorch if the soil dries out. Clay and loam soils usually retain enough moisture, but check weekly in prolonged dry weather. Reduce watering in autumn and winter when growth slows, though the evergreen leaves still benefit from some moisture. Feed in March or April as new growth begins. Scatter a general-purpose granular fertiliser such as blood, fish, and bone around the base of each clump, or apply a layer of well-rotted compost or manure as a mulch. This provides slow-release nutrients and improves soil structure. A second light feed after the June/July cut-back can encourage strong regrowth, but it's not essential. Refresh the mulch layer annually in early spring to suppress weeds and conserve moisture. Pulmonaria is hardy to zone 4, so overwintering is straightforward in temperate Europe; the foliage persists through mild winters and provides valuable ground cover. In very harsh winters some leaves may become damaged, but plants recover quickly in spring. The main pest issue is powdery mildew, which appears as white patches on leaves, particularly in dry conditions or overcrowded plantings. Good air circulation, adequate watering, and the post-flowering shear-back in June or July all help prevent it. Slugs and snails occasionally nibble young leaves in spring; use organic pellets or barriers if damage is severe. Otherwise, pulmonaria is remarkably trouble-free.