Where Agastache is a perennial it will usually brown and dieback to the ground in winter. There's no need for dividing plants in cooler climates. In zone 5 or warmer areas where Agastache is a perennial, each spring cut back the plant by 1/3rd to stimulate new growth.ĭividing & Transplanting: Agastache is grown as an annual in cooler climates and a perennial in warmer climates. If you want to prevent Agastache from sowing seeds, which it does rampantly, deadhead before the flower stalks turn brown and the seeds mature and drop to the ground. If growing Agastache as an annual, keep trimming and deadheading as needed. Pruning too late in the season will stimulate new growth in fall that may not survive the winter. If growing Agastache as a perennial, don't prune or deadhead past midsummer. Deadhead (trim) spent flower stalks to keep the plant tidy.
Trimming & Pruning: Trim back Agastache plants by pinching the new growth in spring to promote bushier growth. However, in very dry conditions, a 1 to 2-inch thick mulch of pine needles or crushed stone can help young plants get established and keep weeds away. Mulching: Since Agastache is drought tolerant, there usually isn't a need for mulching. It also can cause the stems to become floppy and fall over more easily. In fact, too much fertility will cause the plant to flower less and later, and reduce the essential oils in the leaves and flowers. Additional fertilizer usually isn't needed. Once mature, these mint family plants are tough and can go weeks without watering.įertilizing: Amend the soil before planting Agastache with compost. Keep the soil moist for germination and seedling growth. Watering: Agastache is a drought-tolerant herb, especially once established. Also, planting Agastache plants closer together in groups will allow them to support each other and not blow over as easily during a summer storm. If you're trying to grow straighter stems for cutting, you can stake them once the flower stalks form. Staking: Agastache is a strong-stemmed plant that usually doesn't need staking or support. Newer varieties have a broader range of flower spike colors. It sends up flower spikes of purple-to-blue colored flowers from early summer until fall. Plants will reach up to 1' tall with a 2' spread.Growth Habit: Agastache grows 2 to 4 feet tall and one foot wide in an upright form. KUDOS RED is a compact, upright selection of dwarf hybrid hyssop that features vivid red blooms from mid-summer through to early fall.
Genus name comes from the Greek words agan meaning "very much" and stachys meaning "ear of wheat" in reference to the appearance of the flower spikes. Flowers are attractive to bees, hummingbirds and butterflies. Hybrids typically feature dense terminal spikes of tiny 2-lipped tubular flowers which bloom mid-summer to fall in many-flowered verticillasters (false whorls) atop 2-4’ tall stiff square stems clad with opposite pairs of serrate, fragrant (anise/licorice scented) gray-green to medium green leaves. Hybrid flowers come in a variety of different flower colors including shades of red, orange, pink, yellow and white. Agastache, commonly called giant hyssop, is a genus containing about 30 species of upright herbaceous perennials, most of which are native to North America.Īgastache hybrids often have showier flowers and better winter hardiness than species plants.
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