Caring for Hardy Geranium Rozanne

Geranium 'Rozanne' has moderate water needs and tolerates short dry spells once established, but performs best with consistent moisture during summer. Water deeply during prolonged dry periods, especially in full sun or sandy soil, aiming for once or twice a week rather than frequent shallow watering. In partial shade or heavier clay soil, natural rainfall is usually sufficient except in drought. Reduce watering from autumn as growth slows. Feed in early spring—March or April—with a general-purpose granular fertiliser such as blood, fish and bone or a balanced NPK feed (e.g. 10-10-10). Scatter a small handful around the base of each plant and lightly fork it into the soil surface. This supports the long flowering season without encouraging excessive leafy growth at the expense of blooms. A second, lighter feed in early summer can be beneficial if growth seems weak, but 'Rozanne' is not a heavy feeder. Avoid high-nitrogen fertilisers, which produce lush foliage and fewer flowers. Mulch annually in spring with garden compost or well-rotted manure to conserve moisture and suppress weeds. Keep mulch a few centimetres clear of the crown to prevent rot. 'Rozanne' is generally pest- and disease-free. Vine weevil larvae occasionally attack the roots in pots or dry soil; look for wilting despite watering and treat with biological nematodes in spring or autumn. Powdery mildew can appear in very dry conditions; improve air circulation and water at the base rather than overhead. No winter protection is needed in zones 7–9; the plant is fully hardy and will reshoot reliably each spring.