Aster glehni var. glehni was collected in Japan in 2003 on the EJE expedition. This is a giant among the Asters, the very same genus that collects up all the well-known, traditionally recognised Michaelmas Daisies, ranging from red to purple. Collection notes listed this plant as found in Hokkaido amongst mixed forest where the dominant trees are Betula platyphylla and Picea jezoensis, and growing to 0.9m in height.
In the Garden at Edinburgh, where it is on the edge of a bed with tree canopy cover, it reaches in excess of 2m in height. The single stem shoots up to around 1.4m, dividing into flowering shoots at this stage. Grouped together en mass, the splash of white is a tremendous sight.
As the flowers fade, the seed capsules form. These are wind-borne and the typical composite form. This is a strong-growing plant with vigorous rhizomes, so plant with care in your garden.