With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Pamela Anderson is an actress.
text_B: Spiraea tomentosa , commonly known as the steeplebush , meadowsweet , or hardhack , is a plant similar in characteristics to S. douglasii .. Spiraea. Spiraea. Spiraea tomentosa grows to up to four feet high , and prefers moist to wet soil and full sun .. Spiraea. Spiraea. It blooms in summer .. Individual Steeplebush flowers are about 1 / 16 of an inch wide and are arranged in narrow , pyramid-shaped clusters that can be up to eight inches long .. Butterflies and other nectar-feeding insects find the flowers highly attractive .. Butterflies. Butterfly. The flowers are followed by small , dry , brown fruit .. It has a dense white-woolly tomentum which covers its stem and the underside of its leaves .. tomentum. Trichome#Plant trichomes. It is noted for its astringent properties , which cause it to be used medicinally .. The hardiness zone for this plant is listed as zones 4 to 8 .. hardiness zone. hardiness zone. It is found natively in the eastern United States and Canada .. United States. United States. Canada. Canada
not_related.