Answer: Plant sizes are usually expressed as a range because actual mature size will depend on the growing/cultural conditions. Pruning can also have an effect on both density and height. These shrubs are very dense if left unpruned. Most people prune them regularly to enhance the red stem color which is brightest on new growth -- they will prune out a third of the oldest stems each year by cutting them at ground level, or they will renewal prune the entire shrub every few years by cutting it to the ground. If you don't do this type of hard pruning, they will grow to their largest size. The shrub dogwoods will also grow largest in rich, damp soil and full sun; however the variegated forms in my experience tend to be a bit less vigorous than the species and other green leafed forms. Ivory Halo was selected because of its variegation and also particularly for its compact form. Of the two, it is the smaller. Many modern yards have limited space so this is often a desired quality. In your case, you may want to use the larger form. Good luck with your hedge!
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