Agastache (Giant Hyssop, Korean Mint)
A lovely group of plants that are perfect for a sunny border, the Giant Hyssops have attractive aromatic foliage and gorgeous vertical spikes of bottlebrush-like flowers over a very long period from June through until October. The flowers are always popular with bees and butterflies and the seedheads that follow provide a feast for the birds, finches in particular.
Agastache are useful for adding some vertical accent into mixed borders, they mix especially well with ornamental grasses and are great for a mediterranean themed area. Having such tactile flowers paired with aromatic foliage, these are just the thing for a sensory garden. The leaves are edible and good for pepping up salads or infusing to make tea, and so Agastache would not be out of place as a colourful addition to your herb garden too.
As a rough guide planting Agastache as ground cover – 4 plants per square metre is adequate with a little patience, 6 will give better coverage and 9-12 will make a weed supressing carpet very quickly.
Types of Agastache Ground Cover
How to grow Agastache
Position: Full sun
Foliage: Hardy perennial, growth dies down in winter and fresh new growth emerges in spring.
Soil and site: Any well drained soil.
Flowering time: Summer – July-October
Growth rate: Moderate
Ultimate height and spread: Up to 100cm x 50cm
Hardiness: Fully Hardy
Aftercare: Water regularly after planting and through the first season until established. Cut to ground level in Early Spring.