Caring for Pampas Grass

Pampas grass is genuinely low-maintenance once established, with minimal water and feeding needs. During the first season, water every week or two in dry spells to help roots settle in, but after that it's remarkably drought-tolerant. Established clumps rarely need watering except during prolonged summer droughts; overwatering, especially in winter, is far more harmful than underwatering. The roots dislike sitting in wet soil, so ensure drainage remains good year-round. Feed lightly in April and again in May with a balanced general-purpose granular fertiliser (such as Growmore or blood, fish and bone) scattered around the base of the clump. Pampas grass isn't a heavy feeder—too much nitrogen encourages lush foliage at the expense of plumes and can reduce hardiness. A light annual feed is sufficient to support healthy growth and flowering. Avoid feeding after June, as soft late growth is more vulnerable to winter cold. Pampas grass is hardy in zones 7a–10b and overwinters well in temperate Europe, though it benefits from good drainage and protection from excessive winter wet. In colder or exposed gardens, leave the old foliage in place until March to insulate the crown. A gravel mulch around (but not over) the crown helps prevent waterlogging. Pests and diseases are rare. Occasionally, slugs may nibble emerging shoots in spring, but damage is usually cosmetic. Root rot can occur in poorly drained soil, so site selection and drainage are your best defences. Older clumps may die out in the centre; if this happens, lift and divide in late spring, replanting vigorous outer sections and discarding the woody core.