Agastache, or more commonly called Anise hyssop, is a herb that is native to the prairies of North America and has spread throughout the world's temperate zones. It grows primarily in dry or open woods, as well as prairies and farm fields. A member of the mint family, it has a scent similar to licorice and is often called “licorice mint.” The flowers are clustered at the end of spikes and come in colors ranging from white to pink, with some newer hybrids available with red or blue blossoms.
Grow Agastache in full sun to very light shade in well drained soil. It will not tolerate clay soil, but you can work around this by growing it in a raised bed. It will do best with a rich, fertile soil, similar to soil conditions in its native woodlands and prairies.
Water agastache frequently; like most members of the mint family, Anise hyssop is thirsty and will thrive when given copious amounts of water, as long as its soil drains readily. They will need less water once they are established in their growing site
Apply a 2- to 3-inch layer of organic mulch, such as hay or shredded bark, to the growing area around the agastache plants. This will keep the soil evenly moist and keep most weed seeds from germinating.
Fertilize by applying compost and well-rotted manure to the surface of the soil around the plants in early spring. Apply a 1- to 2-inch layer of either or both of these organic soil amendments under the regular mulch.
Remove spent blossoms or agastache will re-seed itself all over your garden. It also spreads by underground runners.
Dig up and divide agastache every three to four years. Replant the divisions, making sure that each contains a bit of roots and a bit of top growth,