How To Grow Agastache Plant

Table of Contents

Olay Agastache is tricky to pronounce, but it remains an herbaceous perennial plant that is well-loved in any garden to lure pollinators. Still, with more than 22 different species, the common ones are Agastache foeniculum, Agastache rupestrist, and Agastache cana.

The Agastache flowers display colorful flower spikes adding energy to the landscaping.

More About Growing Agastache Plant

The Agastache is a tough plant, but you would not think that with one glance looking at the graceful flower spikes with scented leaves. The Agastache is a short-lived perennial plant that can last up to three years in colder climates.

When planting Agastache, it self-sows and will keep popping up for years in the garden. Still, in warmer climates like in the USDA, hardiness zones 5 to 9 grow outdoors, and you can find some hardiness to grow in zone 4.

The Agastache goes by many names, from hyssop, giant hyssop, anise hyssop, and hummingbird mint. Yet the plant Agastache is different from the Hyssopus officinalis (also a hyssop) and the Pimpinella anisum (anise).

But they all belong to the same mint family and are native to North America. You find them in different colors, from purple and orange to red. The Agastache grows up to four feet tall, but you can find compact cultivars growing a foot tall.

You see the colorful blooms from early summer through to fall. The leaves are a green-blue with a sweet anise smell with that hint of mint. The best part is all the varieties you can eat.

Agastache Plant Care

Growing Agastache does not need fertile soils to provide you with a display of blue flowers. The anise-flavored leaves will be a welcome smell year-round. Still, it helps to research the species you have as some are suitable for a xeriscape garden with heat and drought.

While others can grow in cooler climates.

Well-Drained Soil For Plant Agastache

potting mix

When it comes to Agastache care and soil, it does not need fertile soils to grow. You can grow Agastache in lean soil with a low level of nutrients. You can add some sand to your loamy soil to improve it for growing.

The important thing is that Agastache grows in well-drained soil. So whether you grow it indoors or outside, ensure that the soil drains well.

Lighting Needs For The Agastache Flower


Depending on where you live, the Agastache grows well in raised beds in warm climates in the full sun. It can tolerate desert climates, but it helps to provide especially afternoon shade to prevent foliage burning. Most outdoor plants in the species thrive in arid climates and are sure to attract hummingbirds to your garden.

Watering The Agastache Family

The Agastache spp loves deep watering with moist soil, but it must not remain wet the whole time. Hence, you can water deeply and leave the soil to dry between your watering. Too much water will result in root ball rot killing your indoor plant.

Temperature and Humidity


Compared to most other outdoor plants, Agastache thrives in high temperatures and can flourish in spots with afternoon sun. But high humidity is not suitable for this plant as it will remain moist, and the leaves will turn yellow.

During cold seasons the plant needs winter guard as the roots need to remain dry. For this reason, you can add gravel around the plant base or a mulch barrier to prevent the roots from freezing.

Fertilizer For Agastache Plants

Your plant does not need added feeding, but you can provide it with well-rotted manure, organic matter, or pine needles in the fall to provide it with winter protection. Doing this will help with new growth in spring.

Even if your plant is cold-hardy, we still recommend providing your plant with mulch protection at the base to prevent root rot.

Propagating Agastache

You can create your plant in spring or fall using crown division, cuttings, or seed heads.

Agastache seeds

It helps to stratify your seeds as they need to know that winter is past to sprout again. To prevent fungal growth, you can place the seed in a zip seal bag with a sterilized soil mix. Then mix the seed with the soil and add some spoonfuls of water to moisten the soil.

Close the pouch and leave it for ten days switching it between the refrigerator and freezer. So one day in the freezer and one day in the fridge. Then after ten days, you can grow them in a sowing tray.

Alternatively, you can sow the seeds in the garden in a raised bed in the fall.

Growing agastache from cuttings

Grab a pair of turning shears and remove about an eight-inch piece of the stem in late summer or in fall. Then remove the lower leaves and scrape the exposed stem using a sharp knife.

Dip that cut end into rooting hormone and place the cut end into a small pot with a sterile mix of sand and perlite.

Water and cover the container with a plastic bag to create a greenhouse effect. Keep checking the roots every three weeks and keep the soil moist.

Agastache Varieties

When looking to brighten up the garden, you have a wide selection of Agastache varieties available:

Blue Fortune

blue fortune

The Blue Fortune is a European hybrid that blooms soft periwinkle blue flower spikes. The variety can take a bit more rainfall and is cold-cardy in the USDA zones 4 to 10.

Licorice Mint Hyssop

Licorice Mint Hyssop

It is another hardy variety that blooms orange-colored flowers with a dusty purple calyx. The combination is unusual but gorgeous. You get a combined fragrance of mint and licorice that is a feast for your senses.

Many gardeners refer to it as the threadleaf giant hyssop.

Agastache Cana

Agastache Cana

The drought-tolerant perennial plants display a soft rose pink flower. It grows well in containers and has a long blooming period from summer to late fall.

Agastache Firebird


The plant colorful, from the green-gray foliage to the coppery orange flowers.

Agastache Diseases and Pests

From the Agastache seedlings to mature plants are relatively pest free, making them great to have in the garden. The Agastache deer-resistant plant only needs good air circulation, and best not to wet the plant crown as it can lead to fungal diseases.

Furthermore, ensure that the surrounding soil is free of debris, and if needed, add some sand or a soil amendment to improve the drainage to prevent root rot.

Frequently Asked Questions

The best time to collect the vegetation from your Agastache is in the morning, from spring to late summer. The best is to wait until the plant grows bunches of leaves before harvesting for the first time. Then, you can dry the leaves and flowers as they last for months.

The plant works well in pollinator gardens, butterfly gardens, naturalized areas to wildflower meadows. Grown in full sun, it provides food and nectar for the local wildlife. The anise hyssop also grows well in a container garden for flower arrangements.

The plant is rich in polyphenol antioxidants, and people use the Agastache rugosa to treat fever, headaches, digestive issues, cancer, and more.

As the Agastache is a native plant, you can find it readily available to buy in the form of seeds to sow in the garden at your local garden center. Still, Plantly also has the plant available for you, so there is no need to leave your home as it will be delivered to your door.

Whether you want to buy, sell or simply reach out to other plant enthusiasts, Plantly is the right place to be!

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