Growing Japanese Barberry in a pot

Japanese barberry is a low-maintenance shrub once established. Its water needs are low; mature plants tolerate drought well and rarely require watering except during prolonged dry spells in summer. Newly planted specimens benefit from occasional deep watering in their first season, but avoid overwatering—barberry dislikes sitting in wet soil. Feed lightly in March or April with a general-purpose granular fertiliser such as blood, fish and bone or a balanced slow-release product. Scatter a handful around the base of each shrub and water in if the soil is dry. Barberry grows happily in poor soils, so heavy feeding is unnecessary and can lead to soft, disease-prone growth. A top-up of mulch in spring helps suppress weeds and improves soil structure over time. Japanese barberry is fully hardy across temperate Europe and needs no winter protection. Deciduous varieties lose their leaves in autumn, often turning brilliant shades of orange and red beforehand. The bare stems and persistent red berries provide winter interest. Pests and diseases are rare. Barberry is generally resistant to most problems, though aphids occasionally cluster on soft new growth in spring; a strong jet of water or a spray of insecticidal soap usually resolves this. Powdery mildew can appear in dry summers on plants in very sheltered spots with poor air circulation, but it rarely causes lasting harm. Rust (Puccinia) may occasionally affect leaves, causing orange spots; remove and bin affected foliage. The sharp spines make barberry an excellent barrier plant but require care when weeding or working nearby. Wear gloves whenever handling this shrub.