A landowner in Washington faces pressure to cut roots of 20 mature Douglas firs (30‑inch diameter) to pave an alley. Firs have a taproot plus widespread lateral roots in the top 24–36 inches.
Up to 20% of the root system can be cut before stress symptoms (foliage dieback) appear. Cutting roots on one side (the alley side) could remove 50% or more of the root plate, especially with heavy machinery compacting the remaining soil.
Taproots provide vertical anchorage, but lateral roots resist wind throw. Severing laterals on one side reduces stability. Compaction from equipment and future parking adds further risk. The expert advises against the project if tree survival is a priority.
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