Many trees called cedars become substantial landscape trees, but there is no single mature height for “cedar.” True cedars belong to Cedrus; eastern redcedar is a juniper and western redcedar is a Thuja. Identify the botanical name and cultivar before choosing a planting space.
A nursery’s ten-year size is not necessarily the eventual size. The ordinary landscape range also differs from the height of an exceptional old tree in its native habitat. Plan for the tree you are buying rather than a supposed universal cedar average.
Common cedars and their landscape sizes
Eastern redcedar (Juniperus virginiana): NC State’s species profile describes this North American juniper. Standard trees commonly reach roughly 30–40 feet in good conditions, while named selections can have quite different shapes and dimensions. Do not apply the species range automatically to a compact cultivar.
Western redcedar (Thuja plicata): NC State lists a landscape height around 50–70 feet and width of 15–25 feet. Old forest trees can be much larger. A narrow young nursery specimen does not mean the mature tree will fit a small planting strip.
Deodar cedar (Cedrus deodara): this is a true cedar. NC State gives a typical landscape range of 30–50 feet tall and 30–40 feet wide. Its spreading form is as important as its height when deciding whether it belongs beside a house or path.
These examples illustrate why a label saying only “cedar” is insufficient. Other Cedrus species, arborvitae and trees with cedar in their common names need their own size and climate checks. None of these ranges is a promise that growth stops at the upper number.
Measure the available space before planting
Mark the expected canopy width on a simple yard plan. Include overhead wires, roof edges, access routes, neighboring trees and the view you want to preserve. Consider where branches will be when the tree is mature, not only the clearance around the nursery pot.
For a screen, choose the mature width and spacing appropriate to the actual selection. Crowding large trees to get instant privacy can create later maintenance problems. Ask the nursery for the cultivar’s expected mature dimensions and whether its stated size refers to a particular age.
What affects how quickly it reaches that size?
Climate, soil drainage, root condition, light and establishment care all influence growth. There is no dependable “two or three feet every year” rule for every cedar. A newly planted tree may put resources into roots before showing much top growth, and growth varies as the tree ages.
Match the species to the site instead of trying to force height with extra fertilizer. Check moisture around the root ball while the tree establishes, avoid keeping it continually waterlogged and investigate poor growth before feeding. A soil test and local extension advice are more useful than a universal fertilizer schedule.
Can pruning keep a large cedar permanently small?
Do not select an oversized tree on the assumption that repeatedly removing its top will solve the mismatch. Pruning tolerance differs among the plants called cedars, and cutting into old bare wood may leave gaps that do not refill as expected. A qualified arborist can assess an existing tree and realistic options.
For a new planting, choosing an appropriately sized cultivar is usually the clearer decision. If the label is missing from an existing tree, take photographs of its foliage, bark, cones and overall form for identification before deciding how much space it may eventually need.
