Spiraea betulifolia 'Thor'
Spiraea betulifolia 'Thor' is a dwarf and very hardy spirea, forming a small, dense, and regular ball, ideal for borders, embankments, rockeries, or compact plant beds. Its unique, dense, and veined foliage evokes that of birch in spring with coppery bronze highlights, turning bright green in summer, then flaming orange-yellow to vibrant red in autumn. In summer, it produces white corymb flowers, beautifully contrasting with the foliage. Very tolerant of cold, wind, poor soils, and temporary drought, 'Thor' requires almost no maintenance. It is a small structural shrub, discreet in size but spectacular in texture and seasonal color.
Care guide
Light, soil, water and hardiness
Blooming, foliage and shape
Size and growth
Pets
Pollinators
Butterflies
Deer
The availability of our plants varies depending on arrivals, seasons, nursery production and supplier availability. Some varieties may be offered for a limited time only, depending on their natural cycle or current stock. These plant profiles are designed to guide and inspire you when choosing plants for the garden, landscaping projects, containers or long-lasting outdoor arrangements.
