Pruning Feather Reed Grass

Feather reed grass requires very little pruning, but an annual cut-back is essential to keep it looking tidy and to make way for fresh growth. The best time to prune is March, just before new shoots emerge in spring. Many gardeners leave the dried foliage and seed heads standing over winter—they provide structure, movement, and interest in the dormant garden, and the bleached stems look striking after frost or snow. In early to mid-March, cut the entire clump down to about 10–15 cm above ground level. Use sharp bypass secateurs for smaller clumps or a pair of hedging shears for larger, established plants. Some gardeners find it easier to gather the stems together with string or a bungee cord before cutting, which makes clearing up simpler. The old foliage can be composted if it's disease-free, or left as mulch around other plants. Avoid cutting back in autumn. The dead foliage protects the crown from winter wet and cold, and many beneficial insects overwinter in the hollow stems. If you find the dried grass unsightly or it has collapsed in wet weather, you can tidy it lightly, but a full cut-back should wait until spring. 'Karl Foerster' is a sterile cultivar, so it won't self-seed, and there's no need to deadhead for tidiness or to prevent spread. Simply enjoy the feathery beige plumes through summer and autumn, then cut everything back once in March.