I just planted a white Spirea "Snow mound" in sandy soil with a triple blend garden soil in a dug hole twice the depth and width of the 10" shrub in part shade (mornings) to full sun (6-8hrs). I would like to know how much growth height/breadth I can expect the 1st year, and how many years of growth to maturity/full size of 4' h and 5' wide? Thanking you in advance for replying.
Spirea Snow Mound Planting
Certified GKH Gardening Expert
Moderate to fast growth rate, about 8-12 inches per year. Mature height and spread of the shrub is normally about 6-8 ft tall with 12 in. spread. This article should also help: https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm