How to Fertilize spiraea 'Triumphans'?
Shrub slow-release fertilizer applied annually in early spring

spiraea 'Triumphans' · Spiraea × pseudosalicifolia 'Triumphans'
Easy to grow in most moist soils, tolerant of all but the most extreme conditions. A vigorous shrub that in time can form a dense thicket
Shrub slow-release fertilizer applied annually in early spring