Frost aster (Aster pilosus) belongs to the Asteraceae (the Aster family). It is a perennial herb that is native to North America, and was introduced to Japan in the Showa 30s (about 60 years ago). It is often used for flower beds and cut flowers. This herb is well branched and clumping, the height will be 40-120 cm. Leaves are alternate, lanceolate to oblanceolate. A lot of white to pale purple flowers will bloom from July to September. In the neighborhood of our house, it was said that flowers will not bloom unless you cut down the branches on June 6, but the pruning back of June is to prevent the lignification of the stems, to lower the plant height.