Growing English Lavender in a pot

Once established, English lavender 'Hidcote' is remarkably undemanding. Water sparingly—only during prolonged summer drought when the soil is bone-dry. Overwatering causes root rot and yellowing foliage. In typical British and Irish weather, rainfall is usually sufficient except in very dry spells. The plant's silvery foliage and low water need make it perfect for gravel gardens and exposed, free-draining sites. Feeding is not necessary and often counterproductive. Lavender evolved in poor Mediterranean soils and too much fertility produces soft, floppy growth with fewer flowers and reduced fragrance. If your soil is extremely poor, a light sprinkle of general-purpose fertiliser in early spring is the absolute maximum—but most gardeners can skip feeding entirely. 'Hidcote' is evergreen and fully hardy in zones 5a–9a, sailing through winter without protection in temperate Europe. Good drainage is far more important than cold protection; wet winter soil kills more lavender than frost. Avoid cutting back in autumn, as the old growth protects the crown. The gravel mulch applied at planting helps keep the base dry through winter. Pests rarely trouble lavender—its aromatic oils repel most insects. Rosemary beetle (with metallic green-and-purple stripes) occasionally nibbles foliage in late summer; pick them off by hand. The main disease risk is root rot from poor drainage or overwatering. Watch for grey mould (botrytis) on stems in damp conditions; improve air circulation and avoid overhead watering. Refresh the gravel mulch every few years to maintain good drainage around the crown.