Agastache Growth and Care Guide

Agastache, commonly known as Hyssop or Hummingbird Mint, is a long-blooming perennial prized for its aromatic foliage and vibrant, nectar-rich flowers. Native to North America and parts of Asia, Agastache thrives in sunny, well-drained locations and is exceptionally tolerant of heat and drought once established. Here at Garden Delivery, Agastache is one of our top recommendations for Attracting Hummingbirds.

This Plant Guide covers everything you need to know to grow healthy, long-lived Agastache plants with maximum blooms. From sunlight and soil requirements to pruning, winter care, and common problems, this guide is designed to help Agastache thrive in real-world garden conditions.

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By: Reggie Meehan (08/04/25) - Last Updated (01/02/2025)

Introduction to Agastache

Agastache is a beloved garden perennial celebrated for its spiky, colorful blooms, aromatic foliage, and strong pollinator appeal. Native to North America and parts of Asia, Agastache thrives in sunny gardens and is especially valued by those looking to attract bees, butterflies, and hummingbirds. From tall, dramatic varieties like 'Black Adder' to more compact forms like its brother 'Little Adder' this versatile plant brings both structure and charm to beds, borders, and pollinator gardens.

In addition to its ornamental value, Agastache’s fragrant leaves have long been used in culinary and medicinal applications, with anise hyssop standing out for its sweet, licorice-like flavor ideal for teas and herbal remedies. Its resilience, low-maintenance nature, and exceptionally long bloom season—from Spring to first Frost—make it a reliable and rewarding addition to any garden. Whether you’re planting for color, fragrance, or wildlife, Agastache offers beauty and purpose in equal measure.

In all my years of gardening, I have never seen a pollinator magnet quite like Agastache ‘Blue Boa’ with its vivid violet-blue flower spikes. These blooms rise tall above the lush green foliage and seem to buzz constantly with life from dawn until dusk. I’ve watched honeybees, native bees, butterflies, and even hummingbirds take turns dancing from bloom to bloom, creating a spectacle that’s both beautiful and beneficial. It’s not just a plant—it’s a pollinator paradise. 

With most Agastache, even the faintest droop—induced by dryness —triggers an exquisite choreography of pollination. Foraging bees, alerted by subtle chemical cues and the promise of exposed nectar, spiral toward the bruised florets in a frenzy of purpose. It’s a dazzling spectacle: nature’s urgency and beauty intertwined, whispering hope for the waning fortunes of collapsing bee colonies.

If there is only one plant you add to your garden this year, let it be Agastache!

Characteristics of Agastache

There is an elephant in the room that needs to be addressed now … the pronunciation of Agastache. No one pronounces it the same because, over the years, it has had many different accented syllables. Here are several:

• a-GAH-sta-kee

• ag-ah-STAK-ee

• A-guh-stash

The latter appears to be the most currently used pronunciation but the answer is this. Who cares about the pronunciation? Just buy the plant!

Agastache’s unique combination of visual appeal, fragrance, and resilience makes it a must-have for gardeners. Its bottlebrush and tubular flowers come in every color, including purple, blue, red, pink, peach, orange, yellow, and white. And, due to their scent, they are a favorite of hummingbirds, butterflies, and bees.

In addition to its ecological benefits, Agastache is remarkably low-maintenance. It tolerates drought, resists deer, and thrives in well-drained soils. Whether you’re growing a pollinator magnet like Agastache Blue Boa or an eye-catching hybrid like Agastache Kudos Red, this plant is a reliable performer.

Size and Growth Habit

Agastache typically grows between 1 to 4 feet tall, depending on the variety, with a tidy, upright growth habit that rarely flops or sprawls. The stems are sturdy and well-branched, supporting dense clusters of tubular flowers that form elongated spikes, often reaching well above the foliage. These flower spikes not only provide long-lasting color but also add vertical rhythm and dynamic texture to garden designs.

Agastache spreads primarily by self-seeding when spent flowers are left on the plant, dropping seeds that sprout the following season in favorable spots. Some varieties also spread slowly by shallow rhizomes or lateral roots, forming small clumps over time rather than aggressive colonies. 

Leaves and Flowers

The aromatic leaves of Agastache are one of its defining features. When crushed, they release a refreshing, licorice-like fragrance, making the plant a favorite near pathways or seating areas. The gray-green foliage contrasts beautifully with the plant’s vibrant flowers. Some varieties, like Anise Hyssop, even carry a sweet herbal scent strong enough to be used in teas and potpourri, adding an extra layer of utility to their ornamental value.

Agastache’s flowers are densely packed and range from tall bottlebrush spikes like Black Adder and Blue Fortune, to tubular displays of color like Agastache Kudos and Poquito. The flowers not only add beauty but also serve as a vital nectar source for pollinators. These blooms are also highly resistant to deer and rabbits, making Agastache a smart choice for gardens prone to wildlife browsing.

Is Agastache Annual or Perennial?

Agastache is a perennial in USDA Hardiness Zones 4–10, thriving especially well in Zone 8A, like South Carolina’s climate. With proper care, these plants return each year, often becoming more robust as they establish themselves. In colder zones, some varieties may act as short-lived perennials or even reseed themselves to ensure a continual presence in the garden. Well-drained soil is key to overwintering success, as Agastache is particularly sensitive to soggy soils.

Best Varieties of Agastache TESTED

Before we launch into the best of the best of the best, Proven Winners deserves a shout out. Thank you, Proven Winners, for popularizing Hummingbird Mint. This name, which appears to have originated in the 1990’s with David Salman with High Country Gardens, has radically changed the demand for Agastache.

Every time Proven Winners creates a new name for a plant, it causes garden centers across the US to pause. But, the adaptation of the term Hummingbird Mint name is sheer genius. People want to buy Hummingbird Mint. After this plant became known as Hummingbird Mint, sales of Agastache increased and the pollinator population can’t thank you enough, Proven Winners.

Now, back to the Best of the Best:

Blue Boa & Blue Fortune

We love Agastache 'Blue Boa' because we’ve seen it in action. Similarly 'Blue Fortune' holds a #1 ranking for its performance with the bees. Amazing. Blue Fortune has no trial rankings because it has been around for forever (that should tell you something). Blue Boa has a 4.5 out of 5 ranking. There are higher ranking Agastache, but nothing that we’ve seen that attracts the bees quite as well as these soft lavender flowers on sturdy stems. 

Black Adder & Little Adder

Lest we forget where we come from, the original Black Adder at heights up to 4 feet began the movement for pollinator friendly Agastache. Little Adder (half the size) was added later. Neither have rankings because they have been around for so long (with good reason). Striking dark stems and purple flower spikes of the Black Adder/LIttle Black Adder add drama to any garden bed. Because of the success of these two hybrids, a greater demand began for more colors, bushier hybrids and dwarfs. Lest we forget.

Kudos Series

Kudos to TerraNova who bred the Kudos Series of Agastache. Every color ranked 4.6 or higher in test trials (thank you Raker Roberta's) with the exception of the Kudos Red which ranked a 4.0 …it is beautiful, though, let’s be honest, less resilient. TerraNova brags that Kudos is a game changer and we agree. Well branched, dwarf and powdery mildew resistant. Love this series (so do the hummingbirds), especially the less resilient red.

Honorable Mentions

Although we have little experience to date with the Summerlong Series (a Darwin Perennials introduction), the trial data doesn’t lie. This series of Agastache, which range in height from 18-24”, offers a variety of colors, and the trial data show their success … Coral 4.92 (PSU), Lemon 4.79 (PSU), Lilac 4.3 (Raker Roberta, Magenta 4.75 (PSU), Peach 4.3. 

We also have no experience with the Sunrise Series, a series from GreenFuse Botanicals, the trial data tell the story. Sunrise Blue 5, Orange 4.4, Salmon 5, Violet 4, and Yellow 4 (all Raker Roberta); Sunrise Rose 4.79 (PSU); and Sunrise White 4.56 (UGA). We’re just excited that there is a white Agastache!

How to Grow & Care for Agastache

Agastache is a low-maintenance plant that thrives with just a few basic care steps. By planting it correctly and maintaining its growing conditions, you can enjoy its beauty and benefits for years to come.

Planting Agastache

Plant Agastache seeds or seedlings in early spring, spacing them 12–24 inches apart to ensure good air circulation. Use well-draining soil, ideally amended with organic compost, to promote healthy root development. Water thoroughly after planting to help the plants establish. For best results, plant on a slight mound to improve drainage and prevent water from pooling around the crown.

Sunlight Requirements

Agastache flourishes in full sun, needing 6–8 hours of direct sunlight daily. While it can tolerate partial shade, this often results in fewer blooms and less vigorous growth. For best results, choose a sunny spot in your garden. 

Soil Requirements

Well-drained soil is essential for Agastache, as it dislikes “wet feet.” Sandy or loamy soils are ideal, and a neutral to slightly alkaline pH is preferred. Avoid heavy clay soils unless amended with soil conditioner to improve drainage. 

Watering Needs

Young Agastache plants need regular watering until their roots are established. Once mature, the plants are highly drought-tolerant and require minimal watering, making them ideal for low-maintenance or xeriscape gardens. Allow the soil to dry out between waterings to promote deep root growth and reduce the risk of root rot.

Fertilizer Needs

Agastache rarely needs fertilization, thriving even in nutrient-poor soils. However, if growth seems sluggish, a light application of slow-release fertilizer in early spring can provide a gentle boost. Avoid high-nitrogen feeds, which can encourage leafy growth at the expense of flower production.

Pruning & Deadheading

Deadheading spent flowers encourages continuous blooming, while cutting plants back to 6–8 inches in late winter or early spring keeps them tidy and promotes healthy new growth. A midseason trim of the tallest flower spikes can also maintain a compact shape and encourage multiple flushes of blooms.

Overwintering

In colder climates, mulch around the base of Agastache plants to protect their roots during winter. Avoid overwatering during dormancy, as this can lead to root rot. In areas with severe freezes, consider mulch or planting in containers that can be moved to protected areas.

Common Pests and Diseases

While generally pest-resistant, Agastache can occasionally (and we mean only occasionally) attract aphids, spider mites, and whiteflies (in the late summer/fall). Regular monitoring and natural remedies can keep these pests at bay.

Insecticidal Soap & Neem Oil are the best organic remedies for Aphids & Spider Mites. eradication. For whiteflies, if they are identified early, use of organic pyrethrins can eradicate them. Absent early identification and control for aphids and whitefly, the use of acephate (Bonides’ Systemic Insect Control) works well in conjunction with other applications to eradicate problem infestations.

Diseases like powdery mildew, rust, and root rot are rare but can occur in poorly drained soils or overcrowded conditions. Proper spacing and good drainage are key preventative measures.

Common Mistakes

Overwatering is a frequent mistake with Agastache, as it prefers dry conditions. Planting in heavy, poorly draining soil or failing to deadhead spent blooms can also reduce its performance. In windy sites, staking tall varieties prevents stem breakage and ensures they maintain an upright habit.

Common Misconceptions

Agastache is often misunderstood as being invasive, but while it can self-seed moderately, it’s easy to control with simple deadheading. Some believe it doesn’t attract pollinators, but it’s actually one of the best plants for bees and hummingbirds. Growing from seed is also easier than many assume, requiring only light and patience rather than complex stratification.

Using Agastache in the Garden

Agastache is a highly versatile plant that enhances gardens with its beauty, fragrance, and ecological benefits. Its spiky, vibrant flowers provide long-lasting color, while its aromatic leaves add sensory appeal. Beyond aesthetics, Agastache serves as a vital resource for wildlife, especially pollinators, and thrives in various settings, from expansive landscapes to compact containers. Its drought tolerance and low-maintenance nature make it a reliable choice for gardeners seeking functional and ornamental plants.

Attracting Pollinators

Agastache is a standout choice for pollinator gardens, thanks to its ability to attract bees, butterflies, and hummingbirds in droves. The bottlebush spikes and tubular flowers are perfectly designed for these creatures, offering easy access to nectar throughout the growing season. 

With a bloom period that spans from midsummer to early fall, Agastache provides a continuous food source when many other plants have stopped flowering. By planting Agastache alongside other nectar-rich species, you can create a thriving habitat that supports pollinator populations and enhances biodiversity in your garden.

Fragrant Borders

The aromatic foliage of Agastache makes it an excellent candidate for fragrant borders. When crushed or brushed against, the leaves release a licorice-like scent, adding a delightful sensory experience to garden paths or seating areas. This fragrance not only appeals to humans but may also help deter pests, making Agastache a practical as well as decorative choice. For the best effect, plant it in clusters near walkways or patios where its scent can be fully appreciated and its flowers can be enjoyed up close.

Container Gardening

Compact varieties like Agastache ‘Kudos’ or ‘Poquito’ are ideally suited for container gardening, offering both color and fragrance to patios, balconies, and other small spaces. The plant’s upright growth habit and dense flower spikes create a striking display even in limited areas.

Additionally, its drought tolerance means it thrives in containers without frequent watering, making it a low-maintenance option for busy gardeners. Pair Agastache with complementary plants like ornamental grasses or trailing flowers to create a visually dynamic and functional container garden.

Agastache Attracts Pollinators Daily

Agastache is a standout in any garden, offering a perfect blend of beauty, fragrance, and pollinator power. With its long-lasting blooms, aromatic foliage, and low-maintenance nature, it’s a reliable performer from midsummer through fall. Whether you’re planting it for the bees, the butterflies, or simply to enjoy its vibrant spikes swaying in the breeze, Agastache brings life and color to every corner of the garden. Add it to your landscape and enjoy a season full of movement, scent, and effortless charm.