Mexican hyssop (Agastache mexicanus) is a perennial herb in the mint family, native to Mexico. ‘Acapulco Red’ is a popular variety that blooms in fragrant red flowers that attract birds and butterflies. Growing to over 3 feet tall with a 1-foot spread, Mexican hyssop flowers cover the top 15 inches of each flower stalk. Grow the Mexican hyssop in full sun.
Aerate the soil in the planting area by digging into it with the gardening fork to a depth of 12 inches. Toss the soil to the side and crush any large clumps. Sift through it, and remove any rocks or other debris. Add a 3-inch layer of well-rotted manure and mix it in to a depth of 8 inches. Replace the soil in the planting area, and rake it smooth.
Dig a hole that is three times the diameter of the Mexican hyssop’s pot and the same depth. Remove the plant from the nursery pot, and gently unwind any roots that are tight around the rootball. Place the rootball at the bottom of the hole, and pack the soil around it. Lightly tamp the soil around the base of the Mexican hyssop with your feet or hands.
Water the Mexican hyssop until the top 4 inches of soil is moist, and then keep the soil slightly moist for the first two weeks. After that, allow the soil to dry out between waterings.
Add a 3-inch layer of mulch around the base of the Mexican hyssop plants to discourage weed growth.