Agastache (Blue)

Agastache (blue) is a blue-flowering selection within Agastache, a genus of aromatic herbaceous perennials. Upright flower spikes bring midsummer-to-autumn color, while mature size and hardiness vary among species and selections. ## Garden Use Use the flower spikes for vertical color in sunny perennial borders and pollinator plantings. Agastache flowers are visited by bees, and foliage can release an anise-like scent when brushed. ## Growing Conditions Grow in full sun and fertile, well-drained soil. Shade can reduce flowering, and wet soil can cause root problems. Hardiness varies across the genus, so check the selected plant's local winter performance where winters are severe. The [RHS Agastache guide](https://www.rhs.org.uk/plants/agastache) describes the genus, its flowering season, aromatic foliage, and preferred growing conditions. ## Maintenance Remove faded flower spikes to keep the planting tidy. Avoid waterlogged ground, especially in winter, and reassess the clump after winter in colder gardens.