Growing Siberian bugloss 'Jack Frost' in a pot

Brunnera macrophylla 'Jack Frost' is a low-maintenance perennial once established, but it does appreciate consistent moisture, especially during dry spells in spring and summer. Water regularly during prolonged dry periods, particularly if planted in sunnier spots or lighter soils. In typical shaded positions with moisture-retentive soil, natural rainfall is usually sufficient. Avoid overhead watering where possible, as wet foliage in shade can encourage mildew. Feed in March or April as new growth emerges. A light application of a balanced general-purpose fertiliser or a top-dressing of well-rotted compost or leaf mould will support healthy foliage and flowering. Avoid high-nitrogen feeds, which can promote lush leaves at the expense of the plant's natural vigour. Brunnera is not a heavy feeder, so one application per year is enough. This perennial is fully hardy in zones 3–8 and requires no special winter protection in temperate Europe. The foliage may die back in harsh winters, but the plant will re-emerge reliably in spring. Refresh the mulch layer in autumn to protect the crown and maintain soil moisture through winter. Slugs and snails are the main pests, particularly targeting young foliage in spring. Use organic slug pellets, barriers, or hand-pick in the evening. Powdery mildew can appear on leaves in dry conditions or poor air circulation; remove affected leaves promptly and ensure adequate spacing between plants. Leaf scorch may occur if the plant receives too much direct sun—if this happens, consider relocating it to a shadier spot in autumn.