How big does a black walnut get and how long does it live?
Roughly 50 to 75 ft tall with a 30 to 50 ft spread at maturity, making it a large tree but rarely the tallest on a lot, and generally a mid-to-upper cost bracket removal. Straight-stemmed yard walnuts can carry real sawlog value, so it is worth asking whether the homeowner wants the log sold or milled before the trunk gets bucked into 16-inch rounds.
Spread below ground too
Deep taproot, which is why walnut sits tight in wind and why nursery stock is difficult to move, and why the roots causing problems are generally under the tree rather than out in the drive. The real root issue here is chemical rather than mechanical: juglone concentrates in the roots and lingers in the soil, so a bed that failed under a walnut often keeps failing for a season or more after the tree is gone.
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