In addition to the color combination, the flowers have different forms that work well together. The agastache x 'Purple Haze' has wider leaves (typical of a hyssop) and bottlebrush blooms while the agastache aurantiaca has narrow, airy leaves and tiny, tubular blooms.
Why I love agastache - let me count the ways:
- It is deer resistant
- It is rabbit resistant
- It is pest resistant
- It is drought tolerant
- It blooms from midsummer until fall
- It smells good
- It is available in many colors
- Butterflies love it
- Bees love it
- Hummingbirds love it
It is best to plant agastache in the spring so that it can get established before winter. The 'Navajo Sunset' and 'Purple Haze' are suitable for zones 6-9 in full sun location with well draining soil. Some agastache varieties can be grown from seeds and others have to be propagated.
In my experience, I've found that the narrow-leaved varieties such as aurantiaca and rupestris need leaner, drier soil and more full sun than the wide-leaved varieties such as 'Blue Fortune', 'Purple Haze', 'Black Adder' and 'Golden Jubilee'. The wide-leaved varieties have done well in rich soil with more watering than the narrow-leaved types. Prolonged winter wetness is a problem for any agastache.
I have added so many new agastache this summer, including official trials for a plant breeder, that I'm excited to see what next summer brings!