Growing Rhubarb in a pot

Rhubarb has moderate water needs. Water regularly during dry spells in spring and summer, especially while stems are developing, aiming to keep the soil evenly moist but not saturated. In autumn and winter, natural rainfall is usually sufficient. Mulch around the crown each spring with a 5–8 cm layer of well-rotted manure or garden compost; this suppresses weeds, conserves moisture, and feeds the soil as it breaks down. Feed rhubarb twice a year. In March, as growth begins, apply a generous mulch of manure or a handful of general-purpose granular fertiliser (such as blood, fish and bone) scattered around each crown. In September, after harvesting has finished, apply another mulch or feed to replenish nutrients and support next year's crop. Avoid high-nitrogen feeds in autumn, as they can encourage soft growth vulnerable to frost. Rhubarb is fully hardy (zone 3a–8b) and needs no winter protection in temperate Europe. The crown dies back completely and re-emerges in spring. Overwintering is straightforward: simply clear away dead foliage in late autumn and top-dress with compost or manure. Pests are rarely a serious problem. Slugs occasionally nibble emerging shoots in spring; use organic slug pellets or barriers if damage is severe. Crown rot can occur in waterlogged soil, causing the crown to turn soft and brown—prevention is key, so ensure good drainage. Honey fungus is a rare but fatal disease; if a crown collapses suddenly, dig it out and do not replant rhubarb in that spot. Otherwise, rhubarb is a robust, low-maintenance crop that rewards minimal effort with years of reliable harvests.