Agastache, Russian Sage, and Maximilian's Sunflower In The Xeric Garden At SunsetAgastache, Russian Sage, and Maximilian's Sunflower In The Xeric Garden At Sunset

The Tall Grandeur Of The Late Season Garden

By David Salman, Chief Horticulturalist and Founder of High Country Gardens

Many folks think of spring as the peak color season in their gardens. It’s often easy to “front load” the garden with spring flowering plants because that’s the time of the year when gardeners are visiting their local garden centers in search of plants. However, as the growing season stretches into summer, many gardens become very green with few flowers in sight -- That does not have to be the case! Late summer and early fall garden can have just as much color - if not more - as the spring garden, and even taller.

I always advise my fellow gardeners to get out into their gardens in late July and August to have a thoughtful look around. Take a note pad and write down your observations about where you could use more color, and decide what colors would look best. Consider our pollinators - the bees, butterflies and hummingbirds that feast in spring also need to feed through the fall months in preparation for winter. Our gardens can make a huge difference.

A Hummingbird visits Ava Agastache. Photo by Pam K.A Hummingbird visits Ava Agastache. Photo by Pam K.
A Hummingbird Visits Ava Agastache. Photo by Pam K.

Many spring flowering perennials and perennial bulbs tend to be short and medium sized plants, whereas summer and early fall blooming perennials have had many months of growth before their flowers appear. Hence the tall grandeur of late season blooming perennials. Many out-of-town visitors are stunned to see my New Mexico gardens in September. They had no idea that there are so many wonderful flowering perennials that wait until the end of the growing season to bloom. As an added bonus, most of these perennials are nectar sources for hummingbirds, so my gardens are full of these tiny, sparkling birds.

Prairie Salvia (Salvia azurea), Blonde Ambition Blue Grama Grass (Bouteloua gracilis), and AgastachePrairie Salvia (Salvia azurea), Blonde Ambition Blue Grama Grass (Bouteloua gracilis), and AgastachePrairie Salvia (Salvia azurea), Blonde Ambition Blue Grama Grass (Bouteloua gracilis), and AgastachePrairie Salvia (Salvia azurea), Blonde Ambition Blue Grama Grass (Bouteloua gracilis), and Agastache
Prairie Salvia (Salvia azurea), Blonde Ambition Blue Grama Grass (Bouteloua gracilis), and Agastache

Top 10 Favorite Plants For Late Season Color

  1. Purple Coneflowers (Echinacea)  favorite nectar source for bumblebees and butterflies. Native.
  2. Reblooming English Lavender (Lavandula angustifolia) – nectar for bees and fragrance for people. These include ‘Buena Vista’, ‘Sharon Roberts’ and ‘Pastor’s Pride
  3. Goldenrod (Solidago) – fantastic for butterflies and bees. These include ‘Fireworks’, ‘Golden Fleece’ and ‘Peter Pan’. Native.
  4. Agastache (Hummingbird Mint, Hyssop) – showy, fragrant, long-blooming perennials that are essential for a pollinator-friendly garden. ‘Blue Fortune’ (best for Midwest and East Coast), ‘Ava’, ‘Rosita’,  ‘Desert Solstice’ and Agastache rupestris. Both Native and Old World varieties available.
  5. Salvia (Sage) – there are some many and all of them feed the hummingbirds. My favorites include ‘Furmans Red’, Salvia reptans, ‘Ultra Violet,’ and 'Blue Flame' or 'Mulberry Flambe' (Salvia pachyphylla - for western gardens only). Both Native and Old World varieties available.
  6. Hummingbird Trumpet (Zauschneria) –  spectacular orange flowers, rich with nectar that hummingbirds feast on. Native.
  7. Russian Sage (Perovskia) – gorgeous smoky blue flowers. A favorite of honeybees and bumblebees.
  8. Maximilian’s Sunflower (Helianthus) – Towers of flowers in late summer and early fall. Native.
  9. Hardy Plumbago (Ceratostigma) – gorgeous blue flowers and burgundy fall foliage and a long-time favorite of High Country Garden customers! Old World.
  10. Ornamental Grasses (Calamogrostis, Sporobolus, Muhlenbergia, Bouteloua) – all wonderful for fall and winter interest with their ornamental seed heads. ‘Blonde Ambition’ is one of the most unusual and spectacular. Native varieties available.
Blue Spires Russian Sage and Furman's Red Texas SalviaBlue Spires Russian Sage and Furman's Red Texas Salvia
Blue Spires Russian Sage and Furman's Red Texas Salvia

Shop Waterwise Late Season Blooms

  1. Blue Ceratostigma plumbaginoides, Ceratostigma plumbaginoides, Hardy Plumbago

    Hardy Plumbago (Ceratostigma plumbaginoides) is one of the most versatile groundcovers for cold climates growing in both sun and shade and most soil types. Plumbago blooms in late su...

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    Hardy Plumbago (Ceratostigma) Hardy Plumbago, Leadwort Ceratostigma plumbaginoides
    As low as $8.79 Sale $7.03
    Per Plant - 2.5" Pot
    Hardy Plumbago (Ceratostigma plumbaginoides) is one of the most versatile groundcovers for cold climates growing in both sun and shade and most soil types. Plumbago blooms in late summer with deep blue flowers followed by the foliage that turns burgundy red in fall.
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  2. Perovskia atriplicifolia Blue Spires

    Perovskia atriplicifolia Blue Spires (Blue Spires Russian Sage) is the best large growing Russian Sage selection blooming with dark blue flower spikes appearing in mid-summer. Though...

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    Blue Spires Russian Sage Blue Spires Russian Sage Perovskia atriplicifolia Blue Spires
    Sale Price I Save 20%
    $10.99 Sale $8.79
    Per Plant - 5" Deep Pot
    Perovskia atriplicifolia Blue Spires (Blue Spires Russian Sage) is the best large growing Russian Sage selection blooming with dark blue flower spikes appearing in mid-summer. Thought to be a hybrid of two species, this plant has amazing vigor and blooms for many months.
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  3. Echinacea purpurea Magnus

    Magnus is a distinctive, vigorous and large growing cone flower cultivar. The bright reddish-pink petals of its huge flowers are held flat as they radiate out from the cone, instead ...

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    Magnus Echinacea Magnus Purple Coneflower Echinacea purpurea Magnus
    Sale Price I Save 20%
    $10.49 Sale $8.39
    Per Plant - 5" Deep Pot
    Magnus is a distinctive, vigorous and large growing cone flower cultivar. The bright reddish-pink petals of its huge flowers are held flat as they radiate out from the cone, instead of curving backwards as is typical of most coneflowers.
    Learn More
  4. Bouteloua gracilis Blonde Ambition, Blonde Ambition Blue Grama Grass

    Blonde Ambition Blue Grama Grass (Bouteloua gracilis Blonde Ambition PP#22,048) is a native ornamental grass with a completely new look. The horizontal eyelash-like chartreuse flower...

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    Blonde Ambition Blue Grama Grass Blonde Ambition Blue Grama Grass Bouteloua gracilis Blonde Ambition PP#22,048
    As low as $14.99 Sale $11.99
    Per Plant - 2.5" Pot

    Blonde Ambition Blue Grama Grass (Bouteloua gracilis Blonde Ambition PP#22,048) is a native ornamental grass with a completely new look. The horizontal eyelash-like chartreuse flowers appear in mid-summer and age to blonde seed heads by fall. They are held on the plant right through the winter to provide many months of interest. 2011 Plant of The Year

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Shop All Waterwise Season Blooms

Text and photos by David Salman

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