Thunberg Spirea

Thunberg Spirea (Spiraea thunbergii). Spiraea thunbergii, commonly known as Thunberg spirea, is a deciduous shrub with a graceful, finely branched, and slightly arched habit, renowned for its very early and abundant flowering. From early spring, before or at the time of leaf emergence, its branches are covered with a multitude of small, pure white flowers arranged along the stems, creating a spectacular cloud-like effect. Its narrow, linear foliage, light green in spring and then medium green in summer, takes on beautiful orange-yellow to coppery red hues in autumn.

To plant Thunberg spirea, choose a suitable exposure: sun. The recommended soil is as follows: well-drained, tolerates ordinary soil. Water the root ball before planting it and check that water can drain after planting. During recovery, 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 with. In hot weather, monitor recently planted plants more often.

Allow a width of 1.5 m (5 ft) to organize the space for this plant 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. Combine this variety with plants whose light and water needs 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 directly in the ground.