Ash-leaf Spiraea ‘Grefsheim’

Ashy Spiraea ‘Grefsheim’ (Spiraea × cinerea ‘Grefsheim’). Spiraea × cinerea 'Grefsheim' is a graceful spring spiraea, forming a fountain of arching branches covered with small white flowers in April-May. It is distinguished by its very early and dense blooming, in tight clusters along the branches, creating a spectacular snowy effect. Its narrow, gray-green, deciduous foliage complements the lightness of its silhouette. 'Grefsheim' develops a flexible, slightly spreading habit, more contained than Spiraea × vanhouttei, while maintaining a strong presence in the garden. Ideal in a low hedge, as a specimen plant, or in a free-form bed, it is very hardy, tolerant of severe pruning, and undemanding.

To plant Ashy Spiraea ‘Grefsheim’, choose a suitable exposure: full sun. The recommended soil is as follows: well-drained, even poor. Water the root ball before planting and ensure that water can drain after planting. During establishment, check the moisture by hand before watering again. Spread mulch around the base, leaving the collar clear. Avoid systematic fertilizer applications without considering the richness of the soil. In Quebec, choose a period when the soil is thawed and easy to work. In hot weather, monitor newly planted plants more frequently.

Allow a width of 2 m (6.5 ft) to arrange this plant's space in the garden. The indicated height of 1.5 m (5 ft) helps choose its position relative to neighboring plants. Maintain access to the base for weeding, checking moisture, and removing damaged parts. Associate this variety with plants whose light and water requirements are compatible. If you are considering a container, first check that its volume and drainage are suitable for root development. Roots in pots are more exposed to cold than those planted in the ground.