‘Purrsian Blue’ forms a small, perfectly rounded, densely branched clump of tiny, green leaves. Periwinkle blue flowers are coddled by dark purple calyxes just above the aromatic foliage from early summer into early fall. ‘Purrisan Blue’ has everything today’s gardeners are looking for: a low maintenance, drought tolerant, deer resistant, long blooming perennial that looks great all season.