
Roughly 15 to 25 feet tall and about as wide, with 25 to 40 years being realistic in an open lawn and considerably longer in the part shade it actually wants. It is the cheapest removal on this list — often a couple of hours with a chainsaw, no rigging, small stump — which is why homeowners hold a declining dogwood far too long: the removal was never the expensive part of the decision.
Dogwood roots are shallow and fibrous, sitting in the top few inches, and they lose the water competition against turfgrass badly — which is exactly why a dogwood marooned in a mowed lawn on compacted clay struggles. It also means trenching anywhere inside the dripline for irrigation, a fence, or a downspout drain is enough to start a decline that takes two or three years to show up.