Astilbe

Plant in autumn or spring in moisture-retentive soil enriched with plenty of organic matter. Astilbe thrives in partial to full shade and absolutely must not dry out — browning leaf edges are the first sign of drought stress. Mulch generously with garden compost each spring to lock in moisture and suppress weeds. In sunnier positions, increase watering considerably. Feed with a balanced granular fertiliser in April. The dried flower plumes remain attractive through winter, so leave them standing until early spring before cutting back. Divide congested clumps every three to four years in spring to maintain flowering performance.

Leave the dried flower plumes standing through autumn and winter for structural interest. Cut all old stems and foliage back to ground level in late February or early March before fresh growth begins. Remove any damaged leaves during the growing season.