Tomāto, Tomäto: Pronouncing Agastache Could be the Hardest Part of Growing These Superb Perennials


<Agastache rupestris also known as Hummingbird mint.

How do you pronounce the Latin genus known as Agastache?  In Colorado and New Mexico, where we can grow a wide variety of these wonderful perennials, we generally say the name as A gas tä key, A gas key or A gas key. I’ve also heard it spoken as A ga stash ē or A gas tash.  However, if you’re still not comfortable uttering the name in public, call these superb plants by one of their common names; hummingbird mint or hyssop.

Agastache 'Ava' and Salvia reptansPink Agastache, like this Agastache 'Ava shown with Salvia reptans, are extremely attractive to hummingbirds.

The Blue Ones

In general the blue flowered varieties are the more moisture tolerant of the two color groups. They are also a bit more tolerant of enriched soils. Of the entire genus ‘Blue Fortune’ and the Mid-Western species Agastache foeniculatum (Anise Hyssop) are the most reliably cold hardy.  This group of Agastache, are best for feeding butterflies and bees with their abundant nectar .

The Orange, Pinks and Red Ones

The species and hybrids of Southwestern origin (the large flowered orange, pink and red ones) are  more sensitive than the Blue Ones, to cold, wet winter soils. So they are much more challenging to grow in USDA zone 5& 6, regions with rain and snow amounts in excess of about 25” or more per year.

Of course we gardeners love to push the boundaries when trying new plants. So to grow these incredible flowers in wet zones 5 and 6, I recommend planting them in a container garden or pot where they will thrive. Then you can treat them as an "annual" or bring them into a greenhouse, cold frame or cold sun room for the winter. They will be fine for 2 to 3 years in a pot.  In moister, warmer winter climates  such as Washington D.C.  (USDA zones 7) , the Southwestern species and hybrids are very happy as long as the soil drainage is excellent. NO CLAY!!

Agastache cana 'Rosita' with Picea pungens MontgomeryAgastache cana 'Rosita' with Picea pungens Montgomery.

The orange, pink and red  Agastache are unsurpassed at attracting hummingbirds.  If you have them planted, the hummingbirds will find them!

The Secret to Cultivating Agastache

The important thing to remember about successfully growing the Hummingbirds Mints is “tough love.”

  • As a general rule, these plants like to grow in hot, dry conditions once established.
  • As for their soil, the “leaner” (less fertile) and more well drained, the better.  Stay away from rich loams and heavy clay.
  • Fertilize organically with a little quality compost and Yum Yum Mix in the fall.  Chemical fertilizers will push these plants too much and weaken their tolerance to cold.
  • Leave the stems standing over the winter months to increase cold hardiness. Cut back hard in mid-spring.
  • Mulching is only necessary in arid climates. Use crushed gravel, pine needles or crushed nut shells at a depth of 1 to 2 inches.

Agastache will act like annuals when grown in rich, fertile soils with too much water and fertilizer. They’ll grow and flower lushly but are most likely to perish over the winter.

The Best Garden Tested Varieties

Unfortunately, many of the newer Agastache hybrids have had limited testing in outdoor growing conditions. Based on my extensive garden experience with these perennials in the Intermountain West, here are some of my top picks.

Agastache Acapulco® ‘Orange’ – Originally bred in Holland by Keift Seed Co. in the late 1990’s, Acapulco ‘Orange’ is a superior cultivar with excellent cold hardiness and vigor. Long-blooming, clear orange flowers and minty foliage are its best attributes.

Agastache 'Ava' with Helianthus maximiliana 'Santa Fe' Agastache 'Ava' with Helianthus maximiliana 'Santa Fe'

Agastache ‘Desert Sostice’ – A 2012 High Country Gardens exclusive introduction that I bred, this tough hybrid is a cross between the two best Southwestern species Agastache cana and A. rupestris.  A semi-dwarf grower, it has stunning flower spikes with pink and orange flowers and a strong, pleasing herbal scent.

Astastache ‘Ava’ - My best hybrid introduced through High Country Gardens in 2004. If this cultivar is a good fit for your growing conditions, it will be one of your showiest perennials. Blooming for many months beginning in mid-summer, the bright rose-red flowers and non-fading calyxes are stunning.

Agastache cana ‘Rosita’ – A High Country exclusive. A semi-dwarf form of the species, A. cana that I found some years ago grown from habitat collected seed from southern New Mexico. It has about 50% more bright rose-pink flowers (corollas) in the spike than is typical, so the flower spikes are particularly plump and full.  ‘Rosita’ has a most delicious sweet herbal fragrance too.

 

Text and Photos by David Salman

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2 thoughts on “Tomāto, Tomäto: Pronouncing Agastache Could be the Hardest Part of Growing These Superb Perennials”

  • CheyDesignGuy
    CheyDesignGuy 01/24/14 at 1:15 am

    Mr. Salman,

    I planted one of the orange agastaches - sunset hyssop in my garden last year here in Cheyenne. Do you think it will survive the winter? Our soil is more clay than anything. I ripped out my front lawn, amended the soil with an inch of compost and planted all perennials. So really, I did not amend the soil much. The plant was barely a twig when it was planted and then grew into a lovely shape full of flowers. I would surely like to have it flourish in my garden.

    Kind regards,
    CheyDesignGuy

    • David Salman

      Chey, if you are refering to Agastache rupestris, when you write sunset hyssop, I don't think it will be a reliable perennial in Cheyenne. Some winters it might make it, but then fail the next. It's just too cold for extended periods of time. Agastache rupestris, when well established, can tolerate a blast of subzero cold followed by a quick warm up. But not week(s) in the deep freeze. Try it as an beautiful, hummingbird attracting "annual" in one of your hot, full sun container gardens.

      You best best in the ground in WY, is Agastache 'Blue Fortune'. It is zone 4 cold hardy, and needs a rich, well amended clay-loam and regular irrigation.

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