Native to most of North America, it also has origins in Asia and South America. The most commonly grown type, hummingbird mint (Agastache cana), is indigenous to the southwestern United States and Mexico and is suitable for xeriscape gardens, with its tolerance for the heat and drought of arid climates. Other types are more tolerant of temperate growing conditions, so you may wish to research the different varieties to find out what is best suited to your environment. Agastache is deer and rabbit resistant, and a veritable magnet for bees, butterflies and hummingbirds. It’s also a fairly long-blooming perennial, offering vivid color for weeks in summer. It is a close relative of catmint, another pollinator-friendly flowering perennial.
Light
Agastache likes full sun and can easily tolerate the hottest sun of the day, so keep this in mind when deciding where to plant it.
Soil
This desert plant grows best in lean soils with low levels of nutrients. Adding a bit of sand to loamy soils can improve their suitability for growing agastache.
Water
Though it enjoys a deep watering, consistently moist conditions are not suitable for agastache. Watering routines should ideally follow desert conditions: occasional blasts of heavy rain followed by days of hot sun.
Temperature and Humidity
Agastache can handle high temperatures better than many garden plants, so it’s perfect for that spot that gets strong afternoon sun. Humidity isn’t suitable for agastache and growing it in a persistently moist spot will probably cause its roots to rot and its leaves to yellow. It’s also important to make sure the roots of the plant stay dry in winter, especially if growing in USDA zones 5 or 6. Placing some gravel around the base of the plant as a sort of mulch barrier can help prevent root rot from frozen soil that defrosts slowly in spring.
Fertilizer
Agastache has no need of extra fertilizer but a top dressing of compost in autumn will keep it healthy.
Varieties
‘Blue Fortune’ is a European hybrid, with soft periwinkle blue flowers. This variety can also withstand a bit more rainfall and is very cold hardy (USDA 4-10).‘Licorice Mint Hyssop’ is a hardy and strong variety with soft orange colored flowers contrasted with dusty purple calyxes: an unusual and gorgeous color combination. The fragrance combines licorice and mint, a real feast for the senses. Also known as “threadleaf giant hyssop."‘Agastache Cana’ blooms abundantly with soft rose pink flowers (USDA 5-10). It does well in containers and has a long blooming period from early summer to late autumn.‘Agastache Firebird’ is a powerhouse of color, with its grey-green leaves and coppery orange flowers that attract hummingbirds.‘Agastache Honey Bee Blue’ is a classic variety with soft bushy flower spikes of pale lavender blue and slightly larger leaves of bluish green.
Propagating Agastache
To grow agastache from cuttings, use pruning shears to remove 6 to 8 inch pieces of green stem in late summer or fall. Strip off lower leaves and lightly scrape the exposed stem with a sharp knife. Dip the scraped portion in rooting hormone and place the stems in a small pot containing a sterile mix of perlite and sand. Water gently and cover with a large plastic bag or humidity dome. Check for root growth in 2 to 3 weeks by gently tugging on the stem. Keep the soil slightly moist and remove the cover when new leaves begin to sprout.
Growing Agastache from Seed
Once established, agastache will spread fairly vigorously in the garden. It can be divided yearly or as needed. Agastache seeds need cold stratification to grow, so the best method is to direct sow them in the garden in the fall, so they are exposed to the winter cold temperatures. Press seeds gently into loosened soil surface, then moisten them every few days in the fall; if your region gets winter snow this will give them enough moisture to germinate in spring. If your winters are dry, occasional light watering of the seeds will help them to sprout when the spring temperatures warm up.
