Bloom Report (Updated Oct. 1) - Our current weather - cool nights and cool, sunny days - is very conducive to producing vibrant fall color. The overall color at the Arboretum is at 5 to 10 percent and may increase to 20 percent by next week. Our sugar maples are showing red, orange and yellow, red maples along the boardwalk are red & yellow. You'll see yellow in the elms and birch and deep red in the sumac, maroon in the dogwoods.  The aralias along Three-Mile Drive have turned golden yellow. Viburnums also giving us a nice maroon color. In the prairie areas, feast your eyes on the golden brown tall grasses, dotted with purple, blue and yellow asters and sunflowers.

All photos by Arboretum volunteer Dave Poplau unless otherwise specified.

Dianthus by Dave Poplau


Agastache Rugosa/Korean Mint

Artemisia Absinthium/Absinthe


Asiatic Lily
Balloon Flower
Lilium/Asiatic Lily
Platycodon Grandiflorus/Balloon Flower Persicaria Polymorphos/Persicaria
 Rugosa Rose
 Meadow Sage  Prairie Rose
Rosa/Hybrid Rugosa Rose
Salvia Nemorosa/Meadow Sage

Rosa/Prairie Rose Shrub Rose

 Garden Rose
Rosa/Garden Rose Rudbeckia/Black Eyed Susan
 Bloody Cranesbill
Cranes Bill
 Clustered Bellflower
Echinops Ritro/Globe Thistle
Clustered Bellflower
Coral Bells
Coral Bells
Hosta/Plantain Lily
 Antirrhynum Majus/Snapdragon
Helenium Amarum/Sneezeweed
Lobulara Maritima/Sweet Allysum
Chamomile  Petunia  Phlox
Ratricaria Mecutita/German Chamomile  Petunia/Petunia  Phlox Maculata/Meadow Phlox
 Yarrow  Coneflower


Achillea Millefolium/Yarrow

 Verbena  Hydrangea
Verbena/Verbena Hydrangea/Hydrangea
Angelonia Begonia Coreopsis
Angelonia/Angelonia Begonia/Begonia Coreopsis/Coreopsis
Globe Amaranth Hybrid Dianthus Potentilla
Gomphrena Haageana/Globe Amaranth
Hybrid Dianthus/Hybrid Dianthus
Cockscomb Pink Mulla Mulla  Prairie Dropseed
Celosia/Cockscomb Prilotus Exaltatus/Pink Mulla Mulla  Sporobolus Heterolepsis/Prairie Dropseed








Guide to Plants in Full Bloom and Where to Find Them  - 

Week of Aug. 10

Anise Hyssop (Agastache foeniculum) bee friendly, crushed leaves smell of licorice, native to Minnesota. (

Location at Arboretum: Prairie Garden, Iris Pond

Flowering Spurge (Euphorbia corollata) native to Minnesota, poisonous - sap causes skin irritation. (

Location at Arboretum: Prairie Garden, Iris Pond

Wild Quinine (Parthenium integrifolium) resistant to insects and diseases, listed as an endangered species in 1984, native to southeastern parts of Minnesota. (

Location at Arboretum: Prairie Garden, Iris Pond

Gray-headed Coneflower (Ratibida pinnata) native to Minnesota, attractive to birds and butterflies, root was used to treat toothaches. (

Location at Arboretum: Prairie Garden, Iris Pond, Slade Perennial Garden

Hoary Vervain (Verbena stricta) tea from leaves was used to treat stomach aches, Native Americans made flower from roasted seeds, good for prairie restoration projects - easy to grow almost anywhere, native to Minnesota. (

Location at Arboretum: Prairie Garden, Iris Pond

Waterlily (Nymphaea) young leaves and unopened flowers can be boiled and eaten as vegetables, seeds can be ground into flower, flowers are entomophilous - pollinated by insects, usually beetles. (Wikipedia)

Location at Arboretum: Slade Perennial Garden Fountain

Researched and compiled by Rebecca Splichal, student intern


Week of August 3

Garden Phlox (Phlox paniculata) blooms for 6+ weeks, often used as background plants, pinch back before bloom to get fuller plants with more flowers. (University of Minnesota Extension)

Location at Arboretum: Spiegel Garden, Visitor Center Terrace, Terrace Garden, Slade Perennial Garden, Cloistered Herb Garden, Fragrant Herb Garden, Naturalistic Garden, Sensory Garden

Gayflower (Liatris spicata) prairie wildflowers, no fertilizing required, easy to grow, fall division every 2-3 years. (

Location at Arboretum: Terrace Garden, Purple Garden (West entrance to Oswald Visitor Center), Sensory Garden, Prairie Garden

Joe-pye Weed (Eupatorium) drought tolerant, deer resistant, attracts birds, low-maintenance. (

Location at Arboretum: Spiegel Garden, Slade Perennial Garden, Purple Garden (West entrance to Oswald Visitor Center), Naturalistic Garden, Sensory Garden

Annuals (Annual season is at its best!) known for their stunning displays, can bloom all summer long (some require dead-heading), can change design every year for variety. (

Location at Arboretum: Front and Back Terraces of Snyder Building, Front Terrace of Oswald Visitor Center, Annual Garden, Home Demo Garden (Vegetables in particular), Sensory Garden

Hollyhock (Alcea rosoa) easy to grow from seed and easily reseed, attracts hummingbirds and butterflies, can be used as a moisturizer or laxative. (Wikipedia)

Location at Arboretum: Cloistered Herb Garden

Amur Maple Tree (Acer ginnala ‘Embers') beautiful fall color, tolerates shade, tolerates alkaline soils. (University of Arkansas Extension)

Location at Arboretum: Maple Collection


Week of July 20

Daylilies (Hemerocallis) require little to no care, adaptable to most soils, many varieties and flower colors to choose from. (University of Minnesota Extension) *Most beautiful in the early morning, before the heat of the day*

Location at Arboretum: Daylily Collection, Home Demonstration Gardens, Sensory Gardens

Asiatic Lily (Lilium candidum) easy to grow perennial, very hardy, require no staking, thrive in many types of soil. (University of Minnesota Extension)

Location at Arboretum: Asiatic Lily Collection, Sensory Garden

Hydrangea Tree (Hydrangea paniculata) easy to grow, grows well in well-drained areas, many varieties and colors available. (

Location at Arboretum: Spiegel Garden, The Dahlberg Welcome Terrace, Garden for Small Spaces in Home Demonstration Area

Yarrow (Achillea millefolium) can help break a fever and fight cold and flu, lowers blood pressure, used in herbal cosmetics, fragrant. (

Location at Arboretum: Naturalistic Garden, Slade Perennial Garden, Visitor Center Circle

Bee Balm (Monarda) divide every 3 years to prevent spreading, deer resistant, attractive to bees. (

Location at Arboretum: Slade Perennial Garden, Naturalistic Garden

Sumac (Rhus) beautiful red coloring in fall, there are native varieties to MN, considered small tree or large shrub. (

Location at Arboretum: Elm and Honey locust Collection