This is a third species in this genus that is found in the Pacific Northwest, with a much more restricted range than T. agrestis or T. domestica. It can be found along the coastal areas from B.C. south into northern Oregon. It appears to out-compete the Hobo spider as homes in Seattle that previously were well stocked with Hobo spiders in the 1960’s were instead occupied primarily by T. gigantea by the 1980’s. It is commonly found both indoors and outdoors but is nocturnal, hiding during the daytime beneath materials on floors or on the ground and hunting at night.
Indoors the spiders and their webs may be removed with a vacuum cleaner. When the webs are found on plants outdoors the ideal response is to leave them alone and to enjoy them. They are feeding on other unwanted insects and are highly beneficial. If necessary due to customer pressure the plants may be treated with a labeled insecticide for short term relief from the spiders and the web removed with a stream of water.