Guelder Rose in June: monthly care

Guelder rose has a moderate water requirement and copes well once established, but benefits from consistent moisture during prolonged dry spells, particularly in late spring and summer when it's flowering and setting fruit. Water deeply rather than little and often, aiming to moisten the root zone thoroughly every 10–14 days in dry weather. Mulching annually in early spring helps retain soil moisture and reduces the need for frequent watering. Feed in March or April with a balanced general-purpose fertiliser such as blood, fish and bone or a slow-release granular product, scattering a handful around the base of the shrub and lightly forking it into the topsoil. Avoid high-nitrogen feeds, which promote soft leafy growth at the expense of flowers and berries. A second, lighter feed in late April can be beneficial on poor soils, but guelder rose is not a heavy feeder and over-fertilising is unnecessary. This shrub is fully hardy across temperate Europe (zone 3a–8b) and requires no winter protection. Refresh the mulch layer each spring to suppress weeds and improve soil structure as it breaks down. Guelder rose is generally trouble-free but can occasionally suffer from viburnum beetle, whose larvae skeletonise the leaves in late spring and early summer. Inspect foliage regularly from April onwards and squash any clusters of eggs on the undersides of shoots or pick off larvae by hand. Aphids may also colonise soft new growth but rarely cause lasting harm. Powdery mildew can appear in dry summers; ensure adequate watering and avoid overcrowding to maintain good air circulation.